Beneath the town of Derinkuyu in central Turkey’s Cappadocia region, generations of residents carved a city straight down into soft volcanic rock rather than out across the landscape. The result, known today as the Derinkuyu underground city, drops through as many as 18 levels and was large enough to shelter roughly 20,000 people along with their livestock and food stores whenever invaders swept through the surface world above. Much of it remains closed to visitors, but the sections open to the public still convey how an entire settlement once lived, worked, and worshipped below ground for weeks or months at a stretch.
A City Carved Straight Down Into Volcanic Rock
Cappadocia’s landscape is built from thick layers of compressed volcanic ash, a rock called tuff that is soft enough to carve with simple hand tools yet sturdy enough to hold its shape once cut. That combination let generations of builders hollow out kitchens, stables, wine and oil presses, storage rooms, and a chapel, stacked one level below the next rather than spread across a single floor plan.
Local farmhouses still sit directly above sections of the complex, and new rooms and connecting passages have continued to turn up during construction work in the area, suggesting the full extent of the tunnels under the town has not yet been mapped. Derinkuyu is only the largest and best studied of several such underground settlements scattered across the region; smaller ones have been identified beneath at least three dozen nearby towns and villages, though few match its depth or level count.
Eighteen Levels Built to Hold an Entire Town
Estimates drawn from surveys of the site put its potential capacity at around 20,000 occupants, a figure that assumes people crowded in with their animals and enough grain, oil, and water to last out a siege. Stables were typically dug on the upper levels, closer to the surface entrances used to bring animals in and out, while living quarters, wells, and the chapel sat deeper down.
Only a fraction of the full complex is open to tourists today; the rest remains sealed off, unexcavated, or judged unsafe for regular foot traffic. Rooms identified so far include a barrel-vaulted chapel with a baptismal font, a wine press with its stone channels still intact, communal kitchens blackened by centuries of cooking smoke, and small burial niches, all connected by low, narrow corridors that forced anyone moving through the city to duck or crawl in places.
Air Shafts That Still Cool the Deepest Rooms
Keeping a city this size breathable more than 80 meters underground required a network of vertical ventilation shafts cut down through every level, several of which doubled as wells once they reached the water table. Air moving through those shafts helped regulate temperature and clear smoke from cooking fires, and the same shafts are credited with keeping the underground city’s interior at a fairly constant, cool temperature even in the heat of a Cappadocian summer.
Engineers who have studied the layout note that the shaft network also doubled as an early-warning system: sound and smoke rising from the depths could alert those on lower levels to activity above, while the same vertical channels let residents lower buckets to draw water without ever climbing back to the surface.
Rolling Stone Doors Meant to Seal Out Armies
Each level could be closed off from the inside using large disc-shaped stone doors, cut like millstones and set into grooves so they could be rolled across a passage and wedged shut. The doors were heavy enough that they could not be pushed open from the outside, turning each level into its own defensible chamber if attackers made it past the entrance above.
That design meant a besieging force could not simply force its way down floor by floor; it would have to fight through a sealed stone barrier at every level while defenders held the high ground from narrow side passages built for exactly that purpose.
Built by the Phrygians, Expanded by Christians in Hiding
Turkey’s Ministry of Culture and Tourism traces the earliest excavation at Derinkuyu to the Phrygians, who worked the region’s soft rock as far back as the 8th or 7th century BC. The complex reached its greatest extent centuries later, during the Byzantine era, when Christian communities in Cappadocia expanded existing tunnels to hide from Arab raiding parties moving through the region between the 7th and 9th centuries AD.
Long stone-cut tunnels are also said to connect Derinkuyu to Kaymaklı, another underground city roughly nine kilometers away, although much of that connecting passage is no longer passable.
A UNESCO Site Still Only Partly Explored
Derinkuyu sits within Göreme National Park and the Rock Sites of Cappadocia, a region UNESCO added to its World Heritage List in 1985 for its rock-cut churches, cave dwellings, and underground settlements. The site is separately documented on Turkey’s official state museums portal, which lists it among the country’s most-visited archaeological attractions.
The underground city was opened to visitors in the 1960s, decades after local families abandoned the deeper levels for modern housing above ground. Archaeologists and local officials continue to treat Derinkuyu, as described on Wikipedia’s overview of the site, as a working excavation rather than a finished monument, since new chambers keep surfacing as Nevşehir Province grows.
This article was produced with the assistance of AI and reviewed by Morning Overview editors.
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