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Photo: Babbsack, CC BY-SA 3.0 via Wikimedia Commons
This defensive position guards routes through the river valleys; it hasn't been attacked since 1300 but has been kept in good repair. It's really just a citadel wall and turrets with nothing inside. Signs say not to climb onto the walkways along the wall but there's not much else to do here.
Boyabat Castle, is a castle in the town of Boyabat, Sinop Province, Turkey built by the Paphlagonians in antiquity and reconstructed under Roman, Byzantine, and Ottoman rule. The castle functions as a museum today.
© OpenStreetMap contributors
Ottoman mansion converted into a museum of local life.
Büyük Cami
The mosque was built in 1856 AD (1272 AH) and repaired after the 1943 earthquake.