🇹🇷 Turkey · Underground city
Derinkuyu Underground City
Byzantine (with Hittite/Phrygian antecedents debated) · Byzantine Cappadocian / earlier Phrygian/Hittite use
Deepest excavated underground city in Cappadocia, connected to Kaymaklı and 200+ subterranean complexes via 8 km tunnel. Rolling stone doors 500 kg, ventilation shafts, chapels, wineries.
