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Puma Punku in Tiahuanaco - I do not think ''aliens'' were responsible for building this site, but I think ancient man was far more advanced than we as yet understand. The technology needed here was way beyond any later civilisations.
Puma Punku. Stones are made up of granite and diorite. Impossible to cut with the tools used in the period. Yet they have cuts straight as a perfect line. Deep and exact from one end to the other. Each weigh over 800 tons. The nearest quarry is more then 10 miles away.