Beneath the volcanic landscape of Cappadocia in central Turkey lies a vast network of over 200 ancient underground cities. The most famous and deepest of these is Derinkuyu, though several others like Kaymaklı are equally significant archaeological marvels.
The Primary Cities
| Feature | Derinkuyu | Kaymaklı |
| Depth | ~85 meters (18 levels) | ~8 levels (sprawling width) |
| Capacity | Up to 20,000 people | Estimated 3,000+ people |
| Unique Feature | Deepest city; complex ventilation | Widest layout; extensive storage |
| Discovery | 1963 (behind a basement wall) | 1964 (opened to public) |
Why They Were Built
These cities were primarily defensive refuges. While the soft volcanic "tuff" rock made excavation easy, the architecture was designed to withstand long sieges:
Camouflage: From the surface, these cities were virtually invisible to marauding armies (Persians, Romans, and later, Arab forces).
Security: Massive, circular rolling stone doors weighing up to 500kg could only be opened from the inside to seal off tunnels.
Self-Sufficiency: They contained stables for livestock, wine and oil presses, communal kitchens, wells, and even schools and chapels.
Ventilation: Derinkuyu features over 15,000 air shafts that provided fresh air even to the deepest levels.
History & Origins
The timeline of these cities is still debated by archaeologists:
Early Foundations: Some evidence suggests the Hittites began the first levels as early as 1600–1200 BCE.
Expansion: The Phrygians (c. 8th century BCE) are often credited with expanding them further.
Refuge for Christians: During the Byzantine era (7th–11th centuries CE), early Christians used these cities extensively to hide from Roman persecution and later from Arab-Byzantine wars.
Modern Discovery: Many remained in use by local Greek populations until the 1923 population exchange between Greece and Turkey, after which they were largely forgotten until a man in 1963 knocked down a wall in his home and found a hidden tunnel.