Roughly 500 feet (150 m) into the cave, the ceiling dipped down. The pair of explorers had to navigate the flooded cave with a gap of just 6 inches (15 centimeters) between the water and the cave ...

"That's when we discovered the two rings around the stalagmites." The cave, called Tlayócoc, is in the Mexican state of Guerrero and about 7,800 feet (2,380 meters) above sea level.

The Krowathunkooloong ritual items were found inside Cloggs Cave in Victoria. Source: Monash University An ancient tool used to create a curse 12,000 years ago has been unearthed in an Australian ...