Crossed-dome temple of Derbent
Derbent, Russia · built 400
The crossed-dome temple on the territory of Naryn-Kala is an early medieval Christian temple located in the northwestern part of the Naryn-Kala citadel in Derbent, Dagestan. For a long time, it was considered an underground reservoir for storing water.
Church data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).