Göreme is a district of the Nevşehir Province in Turkey. After the eruption of Mount Erciyes about 2.6 million years ago, ash and lava formed soft rocks in the Cappadocia region, covering a region of about 20,000 square kilometres (7,700 sq mi). The softer rock was eroded by wind and water, leaving the hard cap rock on top of pillars, forming the present-day fairy chimneys. People of Göreme, at the heart of the Cappadocia region, realized that these soft rocks could be easily carved out to form houses, churches, and monasteries.
https://en.wikipedia.org/wiki/Churches_of_G%C3%B6reme
Göreme is a district of the Nevşehir Province in Turkey. After the eruption of Mount Erciyes about 2.6 million years ago, ash and lava formed soft rocks in the Cappadocia region, covering a region of about 20,000 square kilometres (7,700 sq mi). The softer rock was eroded by wind and water, leaving the hard cap rock on top of pillars, forming the present-day fairy chimneys. People of Göreme, at the heart of the Cappadocia region, realized that these soft rocks could be easily carved out to form houses, churches, and monasteries.
