Calendar Gate, ruins of the Puerta del Sol, Tiahuanaco, La Paz, Bolivia] | Library of Congress
Tiahuanaco Monuments (Tiwanaku / Pumapunku), Bolivia are made of geopolymer artificial stones created 1400 years ago. – Geopolymer Institute
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Tiwanaku
Pumapunku - Wikipedia
Alien Architects Didn't Build This Pre-Incan Complex, 3D Models Show | Live Science
Puma Punku; A Mystery That May Be Greater Than the Pyramids | Gaia
In Search of Aliens: Mystery of Puma Punku Revealed (S1, E7) | Full Episode - YouTube
Pumapunku - Wikipedia
Pumapunku - Wikipedia
Ancient Aliens" Mystery of Puma Punku (TV Episode 2012) - IMDb
Ancient Aliens on Twitter: "We travel to Bolivia #InSearchofAliens this FRIDAY to investigate the logic-defying structures at Puma Punku. http://t.co/js6v7KIJdU" / Twitter