Rumelihisarı, which was built in 90 days by the order of Fatih Sultan Mehmet, in order to cut the aid that could come from the Black Sea to Byzantium during the Conquest of Istanbul, is one of the most popular historical buildings of the city. The structure overlooking the Bosphorus is also known as Boğazkesen Fortress, in accordance with its purpose. Rumelihisarı, a magnificent structure with its three big towers and ramparts, is located right across Anadolu Hisarı, at the point where the two shores of the Bosphorus come closest to each other.
The fortress, where open-air events such as Rumelihisarı Concerts once took place, is now open to visitors as a museum. Cannons, cannon balls used in the conquest of Istanbul and a part of the chain that is said to close the Golden Horn are still on display at the Rumeli Hisarı Museum.