Derinkuyu, the mysterious underground city of Turkey

In 1963, an inhabitant of Derinkuyu (in the region of Capadocia, central Anatolia, Turkey), demolishing a wall of his house-cave, discovered astonished that behind the same was a mysterious room that never had seen; this room took to another one, and this one to another one and another one. By chance the underground city of Derinkuyu was shortage, whose first level could be excavated by hititas around year 1400 a.C.