Derinkuyu Underground City

Origins and developmentThe first chambers were likely dug by the Phrygians in the 8th–7th centuries BCE, exploiting the soft yet stable volcanic tuff of Cappadocia. Over centuries, later civilizations—including Byzantine Christians—expanded the labyrinth, adding chapels, storage areas, stables, and defensive structures. During the Arab–Byzantine Wars (7th–12th centuries CE) the city served as a refuge for entire communities escaping invasion and religious persecution.Architecture and engineer...