Peer-reviewed chronology built from 102 radiocarbon dates (45 unpublished): Tiwanaku founded around AD 180, Pumapunku and the Akapana built mostly in the AD 600s, a rapid city-wide collapse around AD 1010–1050.
“The Pumapunku is a smaller stepped platform renowned for oversized stone blocks and precisely cut ashlars.” source
Peer-reviewed study: a century and a half of field measurements of the shattered Pumapunku, a site heavily looted in the colonial period, turned into 3D-printed fragments at reduced scale so researchers could test how they fit together.
The DOI resolves to nature.com, which our fetch tool could not pass (cookie check); bibliographic data and abstract checked via Crossref.
OFFICIALJean-Pierre Protzen & Stella Nair, Cotsen Institute of Archaeology Press, UCLA · 2013-02
University press monograph on Tiwanaku's gateways, platforms and walls. The authors performed original experiments with stone tools to learn how the stone was shaped and finished, and argue Inca masonry was inspired by Tiwanaku but not derived from it.
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Press
Newspaper and magazine coverage, then and now. Linked, never copied.
PRESSBMC (BioMed Central), via EurekAlert! · 2018-12-12
Publisher's release on Vranich's study: 140 andesite pieces and 17 sandstone slabs modelled; the building, dated AD 500–950, was ransacked over five centuries and none of its remaining blocks is in its original position.
PRESSArchaeology Magazine (Archaeological Institute of America) · 2018-12-18
News report: Vranich says the builders appear to have made prototypes for each stone type and copied them; the temple was built by the Tiwanaku between AD 500 and 1000 and later restored and reused by the Inca.
“It's almost like it was a pre-Columbian version of Ikea.” source
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Video
Official footage and video discussions. YouTube loads only when you press play.
COMMENTARYHISTORY (YouTube channel) · DATE TO VERIFY
A full episode of Ancient Aliens on the broadcaster's own channel, devoted to Pumapunku as a site for the ancient-astronaut argument.
YouTube · HISTORY · loads only when you press play (youtube-nocookie)
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Analysis
Our own reading of the file, written from the sources on the other sheets. Opinion is marked as such.
Pumapunku is not a lost city but one monument inside a well-studied one. Tiwanaku was founded around AD 180, became one of the first cities in the Andes, and collapsed around AD 1010–1050. The 2023 chronology puts most of the work on Pumapunku in the AD 600s, notes that the first plan was abandoned early, and that building continued with reused stone. Later the Inca restored and reused the site.
The precision is real. The building's andesite and sandstone blocks are large, finely carved and precisely cut, with shapes that repeat. Two lines of work address how. Protzen and Nair shaped and finished stone with stone tools to test the methods, and came away with a new appreciation of what was achieved without metal. Vranich, working from 3D prints of every recorded fragment, concluded that the builders made a prototype for each stone type and copied it, which he compared to a pre-Columbian Ikea.
The scattered look is damage. The site was ransacked over the last 500 years, and none of the surviving blocks stands where it was set. That is why the ancient-astronaut reading finds room here: a wrecked building invites stories. The radiocarbon dates and the masonry studies leave no gap for builders other than Tiwanaku's own.
What it shows
That radiocarbon dates place most of Pumapunku's construction in the AD 600s, within the life of the Tiwanaku city.
That the masonry has been tested experimentally: Protzen and Nair worked stone with stone tools to see how it could have been shaped and finished.
That the blocks follow repeated templates, which suggests standard prototypes rather than one-off feats.
What it doesn't prove
The building's exact original layout; no block remains in its original position.
The precise tools and methods used on each block; experiments show what is possible, not what was done.
How the heaviest blocks were transported.
The other side
Erich von Däniken argues that Pumapunku, at about 4,000 metres in the Andes, could never have been built by its Stone Age inhabitants, and that the blocks were deliberately damaged over the centuries. The point that carries weight with readers is the work itself: precisely cut, repeated shapes look machined to many eyes, and the original layout is lost, so no one can show the finished building. Ancient Aliens has devoted full episodes to the site on the same argument.
A museum-magazine analysis of how von Däniken builds his case, including his claim that stone figures at Tiahuanaco and on Easter Island belong to the same style, which the author answers with a pair of photographs.
COMMENTARYErich von Däniken (book description as listed on Goodreads) · 2009
The book's description says Pumapunku, about 4,000 metres up in the Bolivian Andes, could never have been built by its Stone Age inhabitants, and that its blocks were deliberately damaged over the centuries.
Book listing page; the publisher's own page returned HTTP 403.
TO VERIFY Candidates, not yet checked
UNESCO World Heritage listing 'Tiwanaku: Spiritual and Political Centre of the Tiwanaku Culture' (whc.unesco.org): not opened (UNESCO pages return HTTP 403 to our tool).
Jason Yaeger & Alexei Vranich, 'A Radiocarbon Chronology of the Pumapunku Complex' (Advances in Titicaca Basin Archaeology-2, 2013): seen only on academia.edu, not opened.
Erich von Däniken, Chariots of the Gods? (1968): the original Tiahuanaco passages; not opened.
Full text of Protzen & Nair's book (open access PDF on escholarship.org was too large for our tool).
Found, but not linked to a source we trust. Not on the sheets until they are.
