This prehistoric underground complex takes the cake for the most musical ancient city. Dating back to 4000 ... of Chaco Canyon took underground architecture to spiritual heights with their ...

An underground labyrinth city and aqueduct were recently unearthed in the ancient town of Abarkuh in Yazd Province, Iran.

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 ...

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 ...