Part of the ancient Tiwanaku complex, Puma Punku is an enormous puzzle made of stone. Gigantic blocks lie scattered across the site, each cut with sharp right angles and smooth holes that look like ...

To Fouquet, the formation – stretching 120 meters (394 feet) across the sea floor – looked human-made, and at least worthy of investigation. "Just off Sein I saw this 120m line blocking off an ...

Add Yahoo as a preferred source to see more of our stories on Google. Ancient civilizations accomplished feats of engineering that continue to challenge modern understanding. Despite advances in ...

Throughout history, ancient civilizations erected structures that continue to inspire awe and wonder, but how did they do it? And what secrets lie hidden within the walls of these incredible monuments ...