Ancient Agora. Athens. Greece. View of the Byzantine Christian Church of the Holy Apostles with its decorative brickwork dating from 1000 AD at the Agora. The church has a cross in square arrangement with apses on the four sides and a narthex on its west side. Four columns support the central dome and its floor and altar are made of marble. The few surviving wall paintings in the central aisle are from the 17th century.