Puma Punku sits in the Bolivian Andes at nearly 13,000 feet, part of the Tiwanaku site. Its stonework is what draws the attention: granite and andesite blocks with inside corners cut to within fractions of a millimeter, drilled holes, and H-shaped blocks mass-produced to identical specifications like puzzle pieces. The Tiwanaku civilization built it between roughly 500 and 1000 CE—without metal tools capable of cutting that stone.

The largest blocks top 100 tons. The sandstone came from 10 miles away. The andesite came from across Lake Titicaca—land and water transport, at altitude, where oxygen is scarce. As a logistics problem, that’s formidable.

The ancient-aliens crowd says the precision is too perfect for human hands. Experimental archaeology says otherwise: pounding with harder stones, grinding with sand and water, checking with straightedges and templates gets you there. The technology needed is time and skill, not lost science. Sacsayhuamán above Cusco shows other Andean cultures hit the same standard.

The site itself was thoroughly destroyed—earthquake, deliberate dismantling, or centuries of stone robbery, we don’t know. Today the blocks lie scattered in jumbles, which makes reconstructing the original structure guesswork.

What the precision actually proves is a society with complex organization, specialized craftsmen, and probably record-keeping systems that didn’t survive. That’s more interesting than aliens, and it has the advantage of being supported by evidence.

Puma Punku is one of 100 entries in The Little Black Book of Ancient Mysteries — 99 more where this came from. https://amzn.to/4pSLpH6