AN ANCIENT underground labyrinth city with its own advanced water system has been discovered after researchers stumbled across it in a garden. The sprawling network of twisting passages was found ...

Way down. These weren't just glorified bomb shelters or cozy hobbit holes; these ancient underground cities were full-blown subterranean societies complete with ventilation systems that would make ...

Researchers believe that the tunnel system was an underground representation of the above-ground street network of the ancient Incan city of Cusco. Located about 130 miles from Machu Picchu ...