Lost Worlds · Morona-Santiago Province, Ecuadorian Amazon

Cueva de los Tayos

The Amazonian cave that lured a Moon-walker into the search for a golden library

Mainstream: Natural karst cave; human use from at least c. 1500 BCAlternative: Artificially cut galleries concealing a metal library of a lost civilisation-3.05°, -78.21°

Lost Worlds Myth

At a glance

Cueva de los Tayos is a vast cave system on the eastern slopes of the Ecuadorian Andes, entered by a sheer 65-metre shaft in Shuar territory near the Coangos River, with kilometres of passages and one chamber measuring roughly 90 by 240 metres. Named for the tayos, the nocturnal oilbirds that nest inside, it has long been used ceremonially by the Shuar. In the 20th century it became the epicentre of one of alternative history's most famous sagas: claims of a metallic library left by a vanished civilisation, a bestselling book scandal, and a 1976 British-Ecuadorian expedition whose honorary president was Neil Armstrong.

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The mainstream view

What archaeology says

Geologists and speleologists describe Tayos as a natural cave dissolved and eroded through sandstone and limestone, its strikingly flat ceilings and angular junctions the product of bedding planes and joint-controlled collapse rather than tooling. The 1976 expedition organised by Scottish engineer Stan Hall — one of the largest cave expeditions ever mounted, with over a hundred participants including British and Ecuadorian military personnel and scientists — found no metal library and no evidence of artificial construction in the main system.

What the expedition did find was archaeologically significant: alongside zoological and botanical collections, investigators documented human use of the cave stretching back millennia, with a burial and artefacts, and Padre Pedro Porras's associated archaeological work identified ceramics linked to cultures of the Upano valley from around 1500 BC, with some material argued to be considerably older. The Shuar people have long descended into the cave on ladders to harvest oilbird chicks, and regard it as a spiritual place.

As for the famous artefacts of the Crespi collection in Cuenca — metal plaques and figures given to the Italian Salesian priest Carlo Crespi by local people, and claimed by some to come from Tayos — examinations have concluded that the metallic items are overwhelmingly modern creations in brass and tin, many of them made locally and traded to the generous priest. Neil Armstrong's presence in 1976 was real but honorary; he visited the cave, and later played down any suggestion that he had gone treasure-hunting.

Key evidence cited

Speleological surveys describe a natural karst system; flat ceilings and right angles follow bedding planes and joints
The 1976 Hall expedition, with over 100 participants and scientific teams, found no metal library or artificial construction
Archaeological work associated with the expedition documented indigenous use back to c. 1500 BC, with claims of older material
Metallurgical and iconographic examination of the Crespi collection identifies the metal items as modern brass and tin work
Moricz refused to disclose the library's location even to his own 1969 expedition partners
Neil Armstrong's role was honorary; he later distanced himself from the treasure narrative

The alternative view

What the skeptics propose

The legend begins with Janos 'Juan' Moricz, a Hungarian-Argentine researcher who in 1969 lodged a notarised deposition with the Ecuadorian state claiming that inside Tayos he had found artificial tunnels, sheets of metal inscribed with an unknown script — a metal library — and other treasures of a lost civilisation, which he connected to his theories of Magyar origins in South America. Moricz led a small expedition with Ecuadorian officials that year but declined to reveal the library's precise location.

Erich von Däniken made the story world-famous in The Gold of the Gods (1972), describing crawling through Tayos's man-made passages with Moricz and seeing the metal library himself. The scandal broke when Moricz told Der Spiegel that von Däniken had never entered the cave and that the account was fabricated from their conversations; von Däniken conceded he had used dramatic licence, and the affair became one of the defining credibility battles of the ancient-astronaut genre. Stan Hall, who organised the 1976 expedition partly to test the claims, never abandoned the mystery: he later interviewed Petronio Jaramillo, who claimed to have seen the library as a boy in 1946 — but in a different, still-unidentified cave. Hall's book Tayos Gold (2005) argued the treasure lies elsewhere in the region, and his daughter Eileen Hall has continued expeditions to Tayos since 2017.

Sceptics answer that the deposition proves only that Moricz made claims, not that they were true; that no expedition in half a century has found a single metal plate; and that the Crespi metalwork, the story's only physical exhibit, is demonstrably modern. Supporters counter that the system has never been fully explored, that the Shuar guard their sacred sites closely, and that Jaramillo's separate-cave testimony means the negative results at Tayos itself settle nothing.

Key evidence cited

Moricz's 1969 claim was made in a formal notarised deposition to the Ecuadorian government, not a casual anecdote
Petronio Jaramillo independently claimed to have visited a metal library in 1946, in a cave distinct from the Coangos entrance
Only a fraction of the region's cave systems in Shuar territory has been systematically explored
Stan Hall, an engineer of sober reputation, spent thirty years on the case and died convinced the library exists at an unexplored site
Some blocks near the entrance shaft appear so squarely cut that even 1976 expedition members debated their origin
Shuar tradition treats the deep cave as a sacred otherworld, consistent with something of significance within

Genuinely open questions

Did Moricz genuinely see something in 1969, and if so, in which cave?
Where is the site Petronio Jaramillo described to Stan Hall, and has anyone been back to it?
How much of the greater Tayos karst system remains unexplored?
What is the true age of the earliest human material in the cave?

Worth knowing

The cave is named after its strangest residents: tayos, or oilbirds — the world's only nocturnal, echolocating, fruit-eating birds. Shuar climbers have traditionally descended vine ladders into the blackness to harvest the fat chicks, whose oil was prized for lamps and cooking.