10 Structures on Earth That Defy Engineering Explanation

Odd Whys

From a 100-pound man who moved 1,100 tons of coral alone, to an underground city for 20,000 people with no historical record — these 10 structures exist, they are documented, and no one can fully explain how they were built. ─── CHAPTERS ─── 0:00 The Coral Castle 3:38 The Sacsayhuamán Walls 7:09 Th