2. Puma Punku and Tiahuanaco
The means of construction at Puma Punku is an engineering anomaly that is not even comprehendible by modern scholars. Presumed current knowledge of the Tiahuanaco culture alludes to no writing system or familiarity with the wheel, the architectural accomplishments at Puma Punku are incredible. The largest of the megalithic stones used in construction is 131 metric tons, and made from red sandstone. The nearest quarry for red sandstone is 10 km away from the archaeological site, and the stones would need to be carried up a steep incline.
The stones are cut with extreme precision to lock together like pieces of a puzzle. Sophisticated knowledge of geometry is exhibited in this construction, as well as advanced masonry. These stones are so meticulously cut they suggest technology of mass production, and they fit together so perfectly even a razor blade cannot fit in between them.
One carved stone at Puma Punku has a perfectly straight line, with drilled, equidistant holes, an impossible feat with copper or stone tools.
Archaeologists argue about the dating of Puma Punku, with claims ranging from to mere 440 CE to more outlandishly 15,000 years old. One thing is for certain, modern engineers still find construction of Puma Punku impossible today, even with the use of our modern day technology and engineering tools.