Yoros Castle built
1262 CE.
Shown on the map at 41.179°, 29.094°.
Yoros Castle (Turkish: Yoros Kalesi) is a ruined castle dating back to Byzantine times that stands above the confluence of the Bosphorus and the Black Sea, to the north of Joshua's Hill, in Beykoz district, Istanbul, Turkey. It is commonly referred to as the Genoese Castle, due to Genoa’s possession of it in the mid-15th century.
Text from the Wikipedia article Yoros Castle, licensed CC BY-SA 4.0.