Khertvisi fortress is one of the oldest fortresses in Georgia and was functional throughout the Georgian feudal period. It is situated in Southern Georgia, in Meskheti region. The fortress was first built in the 2nd century BC. The church was built in 985, and the present walls were built in 1354. As the legend says, Khertvisi was destroyed by Alexander the Great.

Source: https://en.wikipedia.org/wiki/Khertvisi