A Landscape Born from Fire
The story of the Göreme fairy chimneys begins with immense volcanic power. Millions of years ago, during the Miocene and Pliocene epochs, three volcanoes—Mount Erciyes, Mount Hasan, and Göllü Dağ—erupted violently. They blanketed the Anatolian plateau in thick layers of hot ash, which consolidated over time into a soft, porous rock called tuff. Some of these tuff deposits reached thicknesses of 100 meters. Later eruptions covered this soft material with a much harder, denser layer of basalt and andesite.
This layered geology began a process called differential erosion. Water from rain and rivers, along with persistent wind, began to wear away the landscape. The soft tuff eroded much more quickly than the tough basalt caprock above it. This harder rock acted as a natural umbrella, protecting the column of tuff directly beneath it. Everything around these protected columns weathered away, leaving behind the conical pillars, some reaching up to 40 meters (130 feet) in height, that characterize the region. Once the protective cap eventually falls, the remaining tuff cone is quickly worn down by the elements. This geological process, still active today, is responsible for the surreal, mushroom-shaped spires locally known as "peribacaları," or fairy chimneys.
A Refuge Carved from Rock
The same soft tuff that allows for dramatic erosion also makes for an excellent building material. Humans have been carving into this rock for thousands of years. Historical records from the Greek writer Xenophon mention Anatolian people living in underground houses as early as the 4th century BCE. Evidence suggests human settlement dates back even further, possibly to the Hittite period around 1800 BCE.
These rock-cut structures reached their zenith during the Byzantine era, from the 4th to the 11th centuries. Early Christians, facing persecution from the Roman Empire and later raids during the Arab-Byzantine Wars, expanded these caves into vast sanctuaries. They didn't just carve simple rooms; they created entire monastic complexes, chapels, and multi-level underground cities. The Göreme Open-Air Museum, a UNESCO World Heritage site, contains a dense collection of these rock-cut churches, many with remarkably preserved Byzantine frescoes dating from the 9th to the 12th centuries.
Some underground cities, like Derinkuyu, were immense engineering feats. Extending to a depth of approximately 85 meters (280 ft), this city could shelter as many as 20,000 people along with their livestock and food supplies. These subterranean networks included ventilation shafts, wells, stables, wineries, and massive, half-ton stone doors that could be rolled into place to block passageways from invaders. These cities provided a stable, defensible environment, remaining inhabited intermittently until the population exchange between Greece and Turkey in 1923.