Derinkuyu, The Underground City

Imagine this: You are doing some rennovations in your  house, and oyu decide to demolish one of the walls.  Only instead of dirt and soil, there is space beyond that wall.  And as you start exploring this strange room beyond, you  realize it's not just one room, it's an entire city, built  underground by the ancients. This is exactly what  happened to this person, and this is the story  of what we've learned about the amazing underground  city of Derinkuyu since that amazing moment of discovery.