challenging everything we thought we knew about ancient civilizations. In 2007, a group of archaeologists accidentally uncovered a massive stone formation beneath the waters of Lake Michigan.

Deep beneath the surface of Qiandao Lake, an ancient metropolis ... intricate stone carvings, and five imposing city gates—an unusual feature in ancient Chinese city design.

This lake was fed by an ancient river and is surrounded by a rich record of stone tools from the African Middle Stone ... Today, Narabeb is a landscape dominated by long sand dunes that tower more ...

The Lake Superior region of America ... A great number of ancient tools have been found, they all consist of hard stone, with single and double grooves for the reception of handles, like those ...