The pretty fishing harbor of Kilitbahir is dominated by this impressive fortress, which like Çimenlik Castle in Çanakkale, was built by Mehmet the Conqueror in 1452. Süleyman the Magnificent added the sturdy interior tower in the 16th century.
As long as you have a head for heights, climbing up to the top of the ramparts here is great fun and provides commanding views across the Dardanelles back to Çanakkale. The ferry here from Çanakkale dock leaves throughout the day when full.