The Hagia Sophia in Thessaloniki, Greece, is one of the oldest churches in the city still standing today. It is one of several monuments in Thessaloniki included as a World Heritage Site on the UNESCO list.
Wikipedia https://en.wikipedia.org/wiki/Hagia_Sophia,_Thessaloniki
Address 9 Αν. Κεραμοπούλου, Θεσσαλονίκη 54622, Greece
Coordinates 40°37'58.03" N 22°56'49.212" E
