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8 amazing structures with mysterious origins

Pumapunku

Photo: Wikimedia Commons

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Pumapunku

Pumapunku (often written as two words: “Puma Punku”) is part of the larger Tiwanaku archeology sites in the Andes of Bolivia.  Sitting a short distance from the famed Lake Titicaca, the stones of Pumapunku are at the center of one of South America's most intriguing historic mysteries. The stones are laid out with accuracy and the geometrical carvings are extremely precise. The straightness of the cutting is like that achieved in modern times with the use of lasers and computerized equipment. 

The quality of the workmanship has led to various theories, with some people attributing the stones to aliens and others to some super-advanced society that vanished from the face of the earth after some sort of catastrophic event.  More reasonable Pumapunku theories include the idea that the stones were not natural, but made using some sort of concrete and moulds. Others suggest that the ancient craftsmen were just extremely skilled and used methods that historians and archeologists haven't discovered or thought of yet.