People expect to find mold, busted pipes, and a rat or two when they tear down a wall in their home during renovation, but in 1963 a man discovered a strange room behind his wall that, with a little bit of digging, led to an ancient underground city.
The man from the Nevsehir Provence of Turkey discovered a tunnel behind the demolished wall, which he followed underground to discover his home stood atop the ancient Derinyuku underground city- an amazing network of tunnels, ventilation shafts and rooms that stretches 18 stories below ground.
The underground city is estimated to date back to between 15th and 12th century BCE, and is believed to have been used by the Hittites as a hiding place during raids, although it's virtually impossible to discern the city's origin since it's carved from naturally-formed rock.
Derinkuyu is one of the six underground cities of Cappadocia that have been excavated so far, and archaeologists believe there may be hundreds more underground cities in the region waiting to be uncovered and explored.
-Via Sunny Skyz