The underground cities of Cappadocia give you an idea of the sensation of what living in a labyrinth felt like. Derinkuyu is one of the 40 subterranean settlements in this area. It was at one time the home for up to 20,000 people. Its 18 stories descend into the Anatolian plateau south of Goreme. The ventilation shafts, circular and descending from the surface to the lower levels, and the massive circular doors remind you of the motivation for moving underground in the first place