I believe there's an ancient archaeological site in Bolivia at an elevation of over 12,000 ft that shows unequivocal evidence of a technological sophistication that, put in the context of when and
![Ancient Calendars and Bolivian Modernity: Tiwanaku's Gateway of the Sun, Arthur Posnansky, and the World Calendar Movement of the 1930s - Sammells - 2012 - The Journal of Latin American and Caribbean Ancient Calendars and Bolivian Modernity: Tiwanaku's Gateway of the Sun, Arthur Posnansky, and the World Calendar Movement of the 1930s - Sammells - 2012 - The Journal of Latin American and Caribbean](https://anthrosource.onlinelibrary.wiley.com/cms/asset/7ca70377-0295-4b20-a320-a2d40091ab7f/jlca.v27.1-2.cover.jpg?trick=1657037661752)
Ancient Calendars and Bolivian Modernity: Tiwanaku's Gateway of the Sun, Arthur Posnansky, and the World Calendar Movement of the 1930s - Sammells - 2012 - The Journal of Latin American and Caribbean
![Ancient Calendars and Bolivian Modernity: Tiwanaku's Gateway of the Sun, Arthur Posnansky, and the World Calendar Movement of the 1930s - Sammells - 2012 - The Journal of Latin American and Caribbean Ancient Calendars and Bolivian Modernity: Tiwanaku's Gateway of the Sun, Arthur Posnansky, and the World Calendar Movement of the 1930s - Sammells - 2012 - The Journal of Latin American and Caribbean](https://anthrosource.onlinelibrary.wiley.com/cms/asset/fb153c86-b6b4-4f84-93a6-8f35ad249bb3/jlca1221-fig-0001-m.jpg)