Rumeli Hisarı

Rumeli Hisarı (Rumelihisarı, "Roman-side fortress") is a triple-walled fortress on the European shore of the Bosphorus, opposite the older Anadolu Hisarı on the Asian side. It was built by Mehmed II in 1452, just a year before the siege of Constantinople, with the explicit purpose of choking the Byzantine capital's resupply routes along the Bosphorus. The construction took four months — and required three thousand workers and a thousand masons — making it one of the most ambitious single-purpose building projects of the 15th century.

The fortress is striking for its irregular, almost organic plan — three large towers (one named for each of Mehmed's grand viziers) connected by crenellated curtain walls, dropping right down to the water's edge. It's one of the best-preserved 15th-century fortresses in the world, with internal buildings (a small mosque, a cistern, residential quarters for the garrison) still standing.

Today Rumeli Hisarı is a museum — a relatively quiet one, with the fortress compound restored in 2019. The most-photographed angle is from across the strait (the Anadolu Kavağı ferry), but the European-side approach over the bridge from Bebek is also classic. The fortress sits on a quiet stretch of the Bosphorus, surrounded by fish restaurants and waterfront tea gardens.

~8 EUR, closed Mondays. Allow 60-90 minutes. Combine with lunch at a fish restaurant in Bebek, one stop south.