On the picture: The western part of Beyazıt II mosque (seen from the South). Note the zigzag pattern in the decoration of the minaret.
Correspondent: J.M.Criel, Antwerpen.
Source: ‘Vakıf Abideler ve eski Eserler’ - Vakıflar Genel Müdürlüğü, Ankara 1983 & Wikipedia.