Matiate

Matiate - Credit: Wikimedia Commons

Matiate is an archaeological site underneath the town of Midyat, in Mardin province, Turkey. It is assumed to have been in use for 1,900 years, at its peak to have been inhabited by up to 70,000 people and is considered to be the largest cave system in the world. Read more on Wikipedia

type: ancient site
date from: None

Source: en.wikipedia.org