OK picture this. It is roughly 500 BC. You are a pilgrim. You have walked, for weeks, up out of the coastal lowlands and into the Peruvian highlands. You have been told, your entire life, that there is a place in the mountains where the gods are physically present, where the priests can see what nobody else can see, where the architecture itself is a kind of mouth through which the divine talks. You arrive at Chavín de Huántar. You are exhausted. You are at ten thousand feet, which means your brain is mildly hypoxic and you do not, strictly speaking, know it. The priests greet you. They have been expecting you. The site has been receiving pilgrims like you for centuries, and the entire operation, you will later realize, runs on a schedule.
You are led into a chamber. The chamber is dark. The walls are stone. There are channels cut into the floor that you cannot see but that, when the priests divert water into them, will produce a deep rhythmic roar that the room is engineered to amplify. You are handed a small carved tube of bone. Through the tube, into your nose, a priest blows a powdered mixture of toasted vilca seeds, which contain DMT, and wild tobacco leaves, which contain enough nicotine to drop a horse. The drug hits in about ten seconds. The room starts to growl. Somewhere in the maze of corridors above you, conch-shell trumpets begin to sound, and the sound, by the time it reaches you, has been bounced off enough stone surfaces that you cannot tell where it is coming from. The priests, who have spent years training to stay functional inside this exact pharmacological state, lead you deeper into the labyrinth. At the heart of the labyrinth, in a chamber lit by nothing, is a fifteen-foot stone monolith. It is carved with the face of a fanged predator. It pierces the floor and the ceiling, like a stake driven through the world. They tell you, in the precise moment your nervous system can hold the least skepticism, that the thing you are looking at is the axis on which the universe turns and that they, the people who brought you here, are the only people on earth allowed to speak to it.
That is, according to a Proceedings of the National Academy of Sciences paper published in May 2025, a roughly accurate description of what was actually happening at Chavín de Huántar between maybe 900 BC and 400 BC. Not folk archaeology. Not a Graham Hancock book. Not a TikTok read. An actual peer-reviewed paper, by a team out of the University of Florida and Stanford, that pulled apart the residue inside a small set of carved bone tubes excavated from sealed chambers at the site, ran it through mass spectrometry, and found, in plain chemistry, the earliest direct evidence we have of psychoactive plant use anywhere in the Andes. The drugs are real. The chambers are real. The acoustic engineering is real. The thing the paper is trying to tell us, and that nobody outside of a few archaeology departments has fully sat with yet, is that we now have physical, chemical evidence for the proposition that one of the oldest known religions in the Western Hemisphere was, in a clinically precise sense, a pharmacological control operation, run by an emerging priestly class, for the specific purpose of inventing the social hierarchy we still live inside today.
Let me unpack that, because the implications are not small.
Wait, Where Is Chavín
Chavín de Huántar is a site in the north-central highlands of Peru, in the Ancash region, in a narrow valley between two arms of the Andes, at about ten thousand feet of elevation. It is a real place. You can fly to Lima, drive eight hours northeast, and walk into it. It is a UNESCO World Heritage Site. There are guides. There is a small museum.
The site was built and used by a culture archaeologists call the Chavín, which is named after the site because the Chavín did not have writing and therefore did not leave us their own name for themselves. The earliest construction at the site dates to roughly 1200 BC. The peak of the Chavín cult, the period when pilgrims were arriving from across the central Andes and the priests were running the operation that the 2025 paper describes, is roughly 900 BC to 500 BC. The site was abandoned, for reasons that are still argued about, somewhere around 400 BC. This is two thousand years before the Inca. The Inca empire, the one with Machu Picchu and the messengers running the royal road, is the Late Horizon. Chavín is the Early Horizon. Chavín is so far in the past, from an Inca perspective, that the Inca themselves probably did not have a clear memory of what Chavín had been.
What is interesting about Chavín, and the reason it has been getting outsized attention in Andean archaeology for over a century, is that it sits at exactly the moment in the South American archaeological record where things change. Before Chavín, the Andean archaeological record is mostly small villages, mostly egalitarian, mostly kin-based. After Chavín, the record is full of stratified societies, monumental architecture, ruling classes, priestly castes, and the long political ladder that eventually produces the Moche and the Wari and the Inca. The Chavín are the inflection point. They are the moment Andean civilization gets organized. The argument has been, for a hundred years, that whatever the Chavín priests were doing in their mountain temple was the engine of that transition, and the 2025 paper is the first time anyone has produced direct chemical evidence of what specifically they were doing inside the engine.
What The 2025 Paper Actually Found
The paper, lead authored by Daniel Contreras, an anthropological archaeologist at the University of Florida, with co-authors at Stanford and at South American institutions including the Pontifical Catholic University of Peru, was published in PNAS in May 2025. The team excavated a set of small tubular artifacts carved from hollow bone, from sealed contexts within the monumental galleries at the site. They ran microscopic and chemical analyses on the residue still adhering to the interior of the tubes. Six of the tubes, in their analysis, contained identifiable organic compounds. Two of those compounds are the ones that matter for our purposes. Nicotine, in concentrations consistent with use of wild Nicotiana species, the South American relatives of the tobacco plant. And bufotenine, plus secondary markers of N,N-dimethyltryptamine, consistent with use of vilca, the seed of Anadenanthera colubrina, a tree native to the South American interior whose dried and toasted seeds are one of the oldest known sources of DMT-class hallucinogens in the archaeological record.
This is the earliest direct chemical evidence of psychoactive plant use anywhere in the Peruvian Andes. We had iconographic evidence before, going back decades. The Chavín carvings depict, with the kind of detail that makes the interpretation hard to argue with, figures inhaling powder through tubes, figures in transformative half-jaguar half-human states, figures holding what appear to be vilca pods. The Tello obelisk, one of the most famous Chavín stones, depicts a fanged deity grasping what is widely interpreted as the seed pod of Anadenanthera colubrina. Researchers have been saying, since the 1970s, that the Chavín almost certainly used vilca. The 2025 paper is the moment that the chemistry caught up to the iconography. We no longer have to argue from carvings. We have residue. The residue is what we thought it would be.
The second thing the paper found, which got less press than the chemistry but is in fact the more important finding, is where the tubes were. The tubes were not in public plazas. They were not in communal feasting areas. They were not in middens that suggest broad social distribution. They were in small private chambers inside the monumental architecture, in spaces designed to hold maybe a half-dozen participants at a time. The pattern of deposition is not consistent with a religion in which the drugs were shared with the community. The pattern is consistent with a religion in which the drugs were administered, by a small priestly class, to a small set of selected participants, inside chambers from which the rest of the population was architecturally excluded.
That distinction is the entire argument of the paper.
Vilca, Tobacco, and the Ayahuasca Question
Let me talk about the pharmacology for a minute, because the specific combination at Chavín is interesting in a way that deserves its own paragraph.
Vilca, Anadenanthera colubrina, is a leguminous tree whose seeds contain bufotenine and N,N-dimethyltryptamine. DMT is the same compound that produces the active visionary experience in ayahuasca, the better-known South American brew. DMT, taken on its own by mouth, does basically nothing, because the human gut produces an enzyme called monoamine oxidase that breaks it down before it reaches the bloodstream. Ayahuasca solves this problem with a second plant, Banisteriopsis caapi, whose harmala alkaloids inhibit monoamine oxidase and let the DMT through. This is a piece of pharmacological knowledge that, when you describe it to a modern chemist, sounds like the kind of thing that should have required a laboratory and a couple of decades of trial and error to figure out. The Amazonian peoples figured it out, by means we still do not fully understand, some unknown number of centuries ago.
The Chavín, working in a different ecological zone, appear to have solved the same problem by a different route. Vilca seeds, when toasted and ground and inhaled as snuff, bypass the gut entirely. The DMT and bufotenine cross the nasal mucosa directly into the bloodstream. The MAO inhibition problem is sidestepped because the digestive enzymes never see the dose. What the tobacco was doing, in combination with the vilca, is the question that pharmacologists have been chewing on since the 2025 paper came out. One reading is that the nicotine load was just there to potentiate the experience, the same way some shamans today take tobacco alongside ayahuasca. Another reading, the more interesting one, is that the priests had figured out that high-dose nicotine has its own inhibitory effects on certain monoamine pathways, and that the tobacco was doing some of the work that B. caapi does in the ayahuasca brew, extending and intensifying the vilca trip. A 2025 follow-up commentary in the literature, titled \"Did the vilca/tobacco snuff combination at Chavín aim for an 'ayahuasca effect',\" makes exactly this argument. We do not yet know if it is right. We do know that the Chavín priests, whatever they thought they were doing, were combining two pharmacologically active plants in a way that produces a more intense and more controllable experience than either would produce alone, and that they were doing this 2,500 years ago, in private rooms, on demand.
The experience itself, for a pilgrim taking this snuff for the first time, would not have been pleasant in any modern sense of the word. The nicotine load alone would have produced violent sweating, possible vomiting, and a brutal cardiovascular response. The vilca on top of that would have produced visual hallucinations, a sense of dissociation from the body, a strong feeling of presence, and the unmistakable phenomenological signature of DMT, which is that you have been transported somewhere else and are being looked at by something not human. All of this would have hit, in the dosing pattern the bone-tube delivery system implies, in under thirty seconds, and would have peaked within ten minutes. The priests would have known the timing. The architecture, as we will see, was built around the timing.
The Architecture Was Part Of The Drug
This is the part that, even if you ignored the chemistry, would tell you the Chavín knew what they were doing.
The monumental core of Chavín de Huántar is not a temple in the sense that a Greek temple is a temple. It is a building whose entire interior is a labyrinth. The galleries are narrow stone corridors, mostly windowless, mostly dark, with low ceilings and frequent turns. They are stacked across multiple levels and connected by stairs and ramps in ways that, even with modern lighting and a printed map, are extremely easy to get lost in. Inside the galleries are small chambers, niches, and the famous central room that holds the Lanzón. The exterior of the building, by contrast, is plain. Most of the visual program of the site is on the inside, and most of the inside is dark.
Underneath the galleries, the architects ran a network of water channels. These were originally interpreted as drainage. More recent work, particularly by John Rick at Stanford and his students, has shown that the channels are too oversized and too elaborate for drainage and that they instead appear to have been an acoustic system. When water is diverted from the Mosna and Wacheqsa rivers into the channels in volume, the water moving through the stone produces a deep low rumble that resonates throughout the gallery system. To a person standing inside one of the dark interior chambers, the rumble does not sound like water. It sounds like a large animal, somewhere in the building, growling. The Chavín iconography is full of jaguars. The largest natural predator in the Andean ecosystem is the jaguar. The pilgrim, dosed and disoriented, would have heard a jaguar.
On top of the water system, the Chavín used conch-shell trumpets called pututus, made from Strombus shells imported from the warm-water coast hundreds of miles away. Twenty intact pututus were excavated at the site in 2001. Acoustic researchers at Stanford's Center for Computer Research in Music and Acoustics, led by Miriam Kolar, have documented in detail what these instruments sound like when played inside the gallery system. The result is that the sound of a pututu played in one chamber, when heard from another chamber, has its directional cues so badly scrambled by the geometry of the corridors that listeners cannot reliably locate the source. Kolar has tested this with naive volunteers in the actual galleries. The volunteers, when asked to point at where the sound is coming from, point in the wrong direction. Kolar's phrase for the interior of the site is that it is not just a physical maze, but a sound maze.
If you put all of that together, you get an environment that is, by design, doing the following things to the pilgrim. It is disorienting them spatially through the labyrinth. It is disorienting them acoustically through the misdirected sound. It is producing a low-frequency rumble that the human nervous system interprets, in dim light, as the proximate presence of a large predator. It is layering, over that rumble, the wail of conch trumpets coming from impossible directions. And on top of all of that, the pilgrim has just had a powerful tryptamine-and-nicotine snuff blown into their nasal passages. The drug is not the experience. The drug is one component of the experience. The architecture is doing as much work as the drug.
The Lanzón
At the center of the labyrinth, in a small dark chamber at the intersection of the gallery system, is the Lanzón. It is a fifteen-foot block of white granite, carved into the shape of a vertical blade or spear or planting stick. It pierces the floor of the chamber and the ceiling above it, so that it visibly extends into both the room below and the room above. Its surface is covered in low-relief carving. The carving, as best as we can read it, depicts a standing humanoid figure with the snarling fanged mouth of a great cat, claws on each hand, snakes for hair, and a stance of frontal authority. It looks, to a modern eye, like a god. It looked, to a Chavín pilgrim in 500 BC, like a god.
The Lanzón is the central cult object of the entire Chavín religion. It is not portable. It cannot be removed. It was carved in place, before the chamber was built around it, and the entire architecture of the gallery system flows around it. To encounter the Lanzón you have to be brought into the central chamber. To be brought into the central chamber you have to be admitted to the labyrinth. To be admitted to the labyrinth you have to be the kind of person the priests have decided is worth bringing in. The whole architecture, the snuff, the sound, the corridors, is structured to deliver the pilgrim, in a precisely calibrated state, face to face with this one carved stone.
What the encounter would have done to a person, given the chemistry and the acoustics and the darkness, is not hard to model. The pilgrim arrives in the central chamber dosed, hearing growls and trumpets from impossible directions, exhausted, hypoxic, disoriented. In the dim light, the Lanzón looms. The DMT phenomenology, at peak, is in part a sense that something is looking at you, something not human, something old. The Chavín priests, having calibrated the dose and the timing, deliver the pilgrim to the Lanzón at exactly the moment the pilgrim is most receptive to the conclusion that the carved stone is, in some literal sense, alive and aware and personally interested in their presence. The conclusion the pilgrim is meant to reach is that they have been seen, by name, by a god. The priests, who have brought them in, are the only intermediaries who can produce this experience. The priests are therefore, in the pilgrim's now-thoroughly-rewired memory of the event, the gatekeepers of the divine.
This is, depending on how you want to phrase it, either the oldest religious experience for which we have a detailed engineering specification, or the oldest documented psychological operation in human history. Both readings, I would argue, are correct.
Why Exclusive Matters
The single most important finding of the 2025 paper, for my money, is not the chemistry. The chemistry is impressive. The chemistry is what is going to get the paper into the popular press. But the chemistry, by itself, is just confirmation of what the iconography already told us. The single most important finding, and the one Contreras has gone out of his way in interviews to emphasize, is that the use was exclusive.
In other ancient cultures that used psychoactive plants, the use was, broadly, communal. The Mazatec mushroom ceremonies in Mesoamerica involve the whole community. The Eleusinian mysteries in ancient Greece, although also restricted in some ways, admitted thousands of participants per festival. The peyote rituals of various North American indigenous traditions are participatory across kin groups. The default cultural pattern, when a society has access to a powerful psychoactive plant, is for that plant to be a shared resource, taken together, in a way that bonds the participants horizontally.
The Chavín appear to have done the opposite. The architectural setting of the snuff use, in small private chambers inside a labyrinthine restricted-access building, is incompatible with broad communal use. The total number of people who could have been physically inside a chamber during a single ritual event is probably six to ten. The total number of people who could have been admitted through the gallery sequence at all, given the architecture, is some tiny fraction of the population the pilgrimage was drawing from. The drugs at Chavín were not for everyone. The drugs at Chavín were for a small number of people the priests had selected, inside a space the priests controlled, in conditions the priests engineered. The experience was not horizontal. It was vertical. It distinguished the people who had had it from the people who had not.
Contreras put it this way in the press cycle around the paper. Taking the substances at Chavín, he said, was not just about seeing visions. It was part of a tightly controlled ritual, likely reserved for a select few, reinforcing the social hierarchy. (If this rhymes with the Cremation of Care ceremony at Bohemian Grove, that is because elites performing engineered ritual to consolidate the eliteness of the elite is, structurally, a three-thousand-year-old play and not a new one.) What Chavín appears to have figured out, possibly for the first time in the New World archaeological record, is that you can use an exclusive, engineered, drug-mediated religious experience as the legitimizing engine for an emerging ruling class. The pilgrim who has been to the Lanzón is now different from the pilgrim who has not. The priests, who control access to the Lanzón, are different from everybody. The hierarchy is not just declared. The hierarchy is produced, ritually, in real time, every time a new pilgrim is dosed.
What This Is Actually Telling Us
Here is where I think the story gets interesting, and where I think the 2025 paper deserves a wider readership than it is going to get.
The argument is not that the Chavín invented religion. There were religions before Chavín. The argument is not that the Chavín invented hallucinogens. People had been using vilca, in various forms, for centuries before Chavín. The argument is that Chavín appears to be the earliest case for which we have direct material evidence of a particular combination ... an engineered altered state, a deliberately designed sensory environment, a restricted-access sacred object, and a small priestly class controlling access to the entire pipeline ... being deployed at scale, on pilgrims, with the apparent and successful effect of legitimizing a social hierarchy that had not previously existed.
That is a recipe. It is a recipe that, once you see it, you start seeing everywhere. The Eleusinian mysteries at the edge of Athens, where some kind of ergot-derived brew was administered in a temple at the end of a long ritual procession, almost certainly used the same recipe in different chemistry. The Soma rites in Vedic India, whose details are obscure but whose central plant remains a subject of ongoing argument, almost certainly used the same recipe in different chemistry. The Aztec teonanácatl rituals, the Mexican peyote mesas, the Christian Mass with its restricted-access transubstantiation, the Sufi dhikr with its breathwork-and-music induction, the entire architecture of the megachurch revival with its lights and bass and altar call ... all of them are, in different costumes and different chemistries, the same recipe. Altered state plus engineered environment plus sacred object plus controlled access equals legitimacy. The chemistry varies. The architecture varies. The recipe does not vary.
The Chavín may have been the first people to put the whole recipe in one building. They are not the last. We are, every one of us, downstream of the discovery.
A Caveat About How Sure We Should Be
Let me put the brakes on for a minute, because I do not want to do the thing the TikTok version of this story is going to do, which is take a six-tube chemistry paper and turn it into a universal theory of religion.
The 2025 paper is good. It is careful. It is restricted in its claims. The team analyzed a specific set of artifacts from a specific set of contexts and reported what they found. The interpretation that the use was exclusive, and that the exclusivity was load-bearing for the production of social hierarchy, is the strongest interpretation the material evidence supports, but it is not the only possible interpretation. It is possible that the snuff tubes excavated to date are unrepresentative of the broader distribution of psychoactive use at Chavín, and that there was a wider, more communal use that simply did not leave traces in the contexts that have been excavated. It is possible that the architectural restriction was less absolute than the building plan suggests, and that more pilgrims got access to the central chambers than the chamber dimensions alone imply. It is possible that the hierarchy interpretation is overreading what is, at base, a paper about chemistry.
The weight of the evidence, taken together with everything else we know about Chavín, is that the hierarchy interpretation is probably correct. The architecture is restrictive by design. The iconography is centered on a few elite figures. The site is at the geographic and political center of a pilgrimage network that drew from a wide region. The post-Chavín archaeological record is full of stratified societies that did not exist before Chavín. The interpretation fits. But I want to be honest with you that it is an interpretation, and that two thousand five hundred years is a long time over which to be confident about exactly what was happening inside a stone building at any given hour.
What is not an interpretation, what is now plain chemistry, is that there were drugs in the bone tubes, that the drugs were powerful, that the tubes were in private chambers, and that the priests were almost certainly the ones blowing the snuff. Everything past that is inference, but the inference is, given the rest of the evidence, the most parsimonious story we have.
Where I Land
The 2025 paper is, in a way, less surprising than it sounds when you describe it in one sentence. Andean archaeologists have suspected for decades that the Chavín used psychoactive snuff. The carvings show it. The botanical ranges support it. The 2025 paper is the moment the chemistry caught up to the suspicion. The headline is the chemistry, but the story is older than the headline.
The part that is hard to sit with is not the drugs. The part that is hard to sit with is the engineering. If the priests at Chavín knew, around 500 BC, that you could combine a tryptamine snuff, a labyrinthine architecture, an acoustically engineered approach to a central sacred object, and a restricted access protocol, and use that combination to manufacture the felt experience of personal divine selection in the nervous systems of a sequence of pilgrims, and if they were running this operation for centuries at a site that other regions came to as the religious center of their world ... then the production of religious legitimacy, in the deepest sense of that phrase, is at least 2,500 years old as a deliberate craft. Religions did not slowly evolve into hierarchy. At least one of them was designed for hierarchy from the start, by people who knew exactly what they were doing.
That does not mean every religion is a Chavín. Most are not. Most religions are accreted, messy, half-deliberate at best. But the recipe is there. The recipe was discovered. The recipe was deployed at scale. And every priestly class since then, whether they know it or not, has been working with one or another version of the same set of tools the Chavín priests had laid out for them in their stone maze in the mountains. The chemistry is different now. The architecture is different now. The sacred objects are different now. The set of tools is not different.
What I keep coming back to, the more I think about this, is the pilgrim. The pilgrim who walked for weeks. The pilgrim who arrived exhausted. The pilgrim who was led through the dark corridors and given the snuff and brought to the carved fanged god and told, in the moment of greatest pharmacological suggestibility, that the world they had been living in had a structure and the priests were the structure's translators. The pilgrim went home, eventually, and described the experience to people who had not been there. The people who had not been there decided that the pilgrim now knew something they did not. The hierarchy did not come from the priests declaring it. The hierarchy came from the people who had not been to Chavín treating the people who had been to Chavín as different. The priests, sitting in their stone maze, ran the engine. Everyone else, walking home down out of the mountains, was the engine's transmission system.
We are still, in 2026, the transmission system. The chemistries have changed. The buildings have changed. The people who control the access to the engineered experience have changed costumes more times than anyone can count. The basic architecture, that a small group of people who know how to produce the experience are different in kind from the people who only know how to talk about it, has not changed. It is as old as the bone tubes in the chambers under the Lanzón.
2,500 years ago, in the mountains of Peru, somebody figured it out. The University of Florida and Stanford just confirmed it by running mass spectrometry on six small carved bones. We are, all of us, still downstream of the discovery.
... Lucid Rob
If you're into this kind of thing ... more conspiracies, more weird history, more of the stories nobody teaches you straight ... I've got a whole channel of it. Come hang out, drop a comment, argue with me about whether the priests were running a scam or running the actual divine, let's actually talk about this stuff. https://www.youtube.com/@LucidRobYT ... new videos every week.