The castle sits directly across from the Joshua's Hill (Yuşa Tepesi), which is another significant historical and religious landmark in the area.
During the Ottoman era, the castle was garrisoned to protect the Bosphorus against raids from Cossack pirates coming from the Black Sea.
The structure occupies a site that has been utilized for defense since the Phoenician and Greek eras, long before the current medieval masonry was laid.
Architectural analysis shows masonry techniques characteristic of the 13th-century Byzantine era, though parts were reinforced under Sultan Bayezid I.
Inscriptions found in the castle walls historically identified it as a military base for the Genoese Republic, leading to its popular nickname, though this was largely a trade-related presence.
The site was once part of a larger defensive chain, including a massive iron chain that could be stretched across the Bosphorus to block enemy ships.
Yoros Castle, also known as the Genoese Castle, sits on a strategic hill at the junction of the Bosphorus and the Black Sea in Beykoz. Its name likely derives from the Greek word 'oros,' meaning mountain. While often attributed to the Genoese, historical evidence suggests the fortifications were established by the Byzantines to control Black Sea trade routes. The site features the remains of defensive walls and a series of towers constructed during the Byzantine and Ottoman periods. It occupies a high promontory providing wide views of the third Bosphorus bridge and the northern entrance to the strait. Much of the site remains an active archaeological zone, limiting access to certain excavated sections. The castle served as a customs and surveillance point for centuries, regulating maritime traffic between the Euxine Sea and the capital. It represents one of the most prominent surviving Byzantine-era defensive fortifications in the Istanbul region.
The western edge of the wall provides a panoramic view of the Yavuz Sultan Selim Bridge and the northern Bosphorus.
Wear sturdy walking shoes as the path leading up to the castle is steep and composed of uneven, weathered stone and dirt.
Visit on a weekday to avoid the heavy weekend crowds of local sightseers from the nearby Anadolu Kavağı village.
Bring water and snacks, as there are limited facilities directly within the historical site boundaries.
Do not attempt to climb onto the fragile, crumbling exterior walls for photos, as the stones are unstable and the drop is significant.
Occasionally restricted during archaeological survey periods; closed on Mondays.
