Between the 6C and 10C, barbarian hordes threatened Cappadocia, forcing the local inhabitants underground. Whole underground cities were built that replicated their world above ground, with chapels, huge rooms, latrines and storerooms. The entrance to these cities, usually an almost invisible hole, opens into a completely hidden world. It has been estimated that there are around 150 of these underground cities in Cappadocia and they are one of the region’s main attractions. The best examples are Derinkuyu, with 18 different levels built to a depth of 55m, and Kaymakli, which is accessed via an 80m-high spiral staircase.