Anadolu Hisari
A Small Fortress Built In 1395 By Sultan Bayezid I, Among The Oldest Ottoman Structures On The Bosphorus, With A Tower And Walls Beside A Creek And The Pretty Goksu Pavilion Nearby. A Quiet Stop With Views Across The Narrowest Part Of The Strait To Rumeli Hisari · Beykoz, Istanbul
Anadolu Hisari, the Anatolian Fortress, stands on the Asian shore of the Bosphorus at the mouth of the Goksu stream, in the Beykoz district, directly across the narrowest part of the strait from Rumeli Hisari. It was built in 1395 by Sultan Bayezid I as a base for his planned siege of Constantinople, and it is generally counted among the oldest Ottoman buildings on the Bosphorus (confirm). The fortress is small: a square tower, a ring of walls and an outer defence that follow the hillside, with a tidy village of wooden houses around its foot. In 1452 Mehmed II built Rumeli Hisari opposite, and between the two fortresses the Ottomans could close the strait to ships. Today it is a quiet place to see an early Ottoman military site, with a pleasant shore walk to the Goksu pavilion and park, and views across the water to the Rumeli towers. Check whether the interior is open or under restoration before you plan the visit (confirm).
Anadolu Hisari, the Anatolian Fortress on the Asian shore of the Bosphorus at the mouth of the Goksu stream, opposite Rumeli Fortress; coordinates approximate, Beykoz, Istanbul, Turkiye
The village and shore are free to walk at any hour. The fortress interior has had varying access, with some years open on weekdays and some under restoration, so confirm the current status and hours before travelling. When open, hours are commonly about 09:00 to 17:00, often closed on one weekday, usually Monday (confirm). The Goksu park and the quay cafes keep daytime and evening hours, and tea gardens by the water are busiest at weekends. If the gate is closed you can still see the tower and walls from the lane and the shore road.