Küçüksu Mihrişah Valide Sultan Mosque
Beykoz starts at Küçüksu. It can even be said without exaggeration that Beykoz starts at Küçüksu Mihrişah Valide Sultan Mosque. The Mosque is beside Küçüksu River, the border. Its construction was ordered by Mihrişah Valide Sultan in 1750s. Its harem area is 214m2, it has stonewalls, a plastered an wooden hipped roof, and the Mosque is one of the typical, humble masjids of the Bosphorus. It is built to function as the worship place for the pavilion right beside it and the Bostancı Barracks. It was renovated in 1835 by Mahmud II.’s decree.
The mosque building is used as the administrative headquarters of the Anadoluhisarı İdman Yurdu Sportive Club from 1938. Then it is assigned successively to the Anadoluhisarı Police Station, to the Commune Administration and to the Cumhuriyet Halk Party (political party). While it was being used by the Commune Administration, circumcision ceremonies were conducted inside the mosque building. After Anadoluhisarı İdman Yurdu moves out of the building in 1948, the building is left to its fate. It is completely destroyed in 1959. 55 years later, Mihrişah Valide Sultan Mosque is rebuilt according to the original under the Historical Küçüksu Promenade Revival Project carried out by İstanbul Metropolitan and Beykoz Municipalities, and is opened for worship.