Tiahuanaco Monuments (Tiwanaku / Pumapunku), Bolivia are made of geopolymer artificial stones created 1400 years ago. – Geopolymer Institute
Gate of the Sun - Wikipedia
How to explore of the enigmatic stone blocks of Puma Punku and Tiahuanaco | Kuoda Travel
How to explore of the enigmatic stone blocks of Puma Punku and Tiahuanaco | Kuoda Travel
UNESCO World Heritage Centre - Document - Ruins of Puma Punku. Tiwanaku: Spiritual and Political Centre of the Tiwanaku Culture (Bolivia (Plurinational State of))