The fortress looms over the village of Khertvisi. The outcrop was used as a fortress from the second century BC, and was reputedly destroyed by Alexander the Great. The "modern" fortress, however, was built around the thirteenth-fourteenth centuries, and saw fighting during the Ottoman invasion (and subsequent occupation) in the sixteenth century. The walls on the far side drop down a sheer cliff to the Mtkvari far below, so if you fancy a bout of vertigo, pull yourself up and look straight down.