Add Yahoo as a preferred source to see more of our stories on Google. The existence of a tunnel network under the ancient Peruvian city of Cusco had been rumored for centuries. At times stretching ...

Petty Johns Cave is not a single chamber, but a sprawling underground labyrinth shaped by water and time. Its twisting passages, sudden drops, and narrow corridors have challenged explorers for ...

The Incan Temple of the Sun in Cusco has long been a visual and cultural jewel of the ancient empire. But there’s even more to admire below ground. Recently, archaeologists confirmed a long-held rumor ...