Anadoluhisarı

Anadoluhisarı (English: Anatolian Fortress), known historically as Güzelce Hisar ("the Beauteous Fortress") is a medieval Ottoman fortress located in Istanbul, Turkey on the Anatolian (Asian) side of the Bosporus. The complex is the oldest surviving Turkish architectural structure built in Istanbul, and further gives its name to the neighborhood around it in the city's Beykoz district.