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The Cave City of Vardzia is a cave monastery dug into the side of the Erusheli mountain in southern Georgia near Aspindza. It was founded by Queen Tamar in 1185.
The monastery was constructed as protection from the Mongols. and consisted of over six thousand apartments in a thirteen story complex. The city included a church, a throne room, and a complex irrigation system watering terraced farmlands.
The only access to the complex was through some well hidden tunnels near the Mtkvari river.
An earthquake in Samtskhe destroyed approximately two thirds of the city in 1283, exposing the caves to outside view and collapsing the irrigation system.(Wikipedia)