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.
Khertvisi fortress is one of the oldest fortresses in Georgia. Located in the southern part of the country north of the town Khertvisi. Khertvisi fortress fortress stands on a high rocky promontory above the river Mtkvari and the way of connecting the town of Akhaltsikhe in Akhalkalaki. Fortress, whose ruins are preserved here, was built in the 10th century. At this stage, but became fortified strength already in the 2nd century BC. Since the strength of lead down to the river two underground tunnels. One tunnel was used for water supply and the second would be to enter the fortress.