The underground structures of Hagia Sophia, which have been neglected, are being cleaned and opened for visitation
The underground tunnels, vaults, corridors, and the three-chamber underground tomb of Hagia Sophia, which is among the wonderful works of the world, are planned to be cleaned and opened for visitation. Built in 537 by Emperor Justinian I, Hagia Sophia was considered the religious and cultural center of the Byzantine Empire for many years, as