The Cathedral of Mren is a 7th-century Armenian church in an abandoned medieval town site called Mren. It is located in the Kars region of Turkey, near the border with Armenia, about 1.5 km west of the Akhurian River.
Wikipedia https://en.wikipedia.org/wiki/Cathedral_of_Mren
Official Website http://virtualani.org/mren/index.htm
Address 36670, Turkey
Coordinates 40°14'32.28" N 43°39'46.684" E