Vanis Kvabebi is a cave monastery in Samtskhe-Javakheti region of Georgia near Aspindza town and the more famous cave city of Vardzia. The complex dates from 8th century and consists of a defensive wall built in 1204 and a maze of tunnels running on several levels in the side of the mountain.
There are also two churches in the complex. A newer stone church that is in quite good shape stands near the top of the wall, and a smaller, domed church that clings to the rock on the level of the highest tunnels.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.