The interior of the Yeni Cami (also: Hamidiye Camii) – New Mosque, Mosque of Hamid (sultan Abdülhamid II).
Built at the beginning of the 20th century.
On the picture: the mihrab, decorated in Turkish (neo-)Rococo style.

Mihrab = a semicircular niche in the wall of a mosque that indicates the direction of the Kaaba in Mecca and hence the direction that Muslims should face when praying. The wall in which a mihrab appears is the "qibla wall."

Correspondent: J.M.Criel, Antwerpen.
Sources: Website of ‘asirproje.com’ & Wikipedia.