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Eski Hisar Castle, which belonged to the pre-Ottoman period in Gebze, was built by the Byzantines. With the conquest of Istanbul, Sultan Mehmed the Conqueror put his soldiers in the castle. The descendants of these soldiers are said to live in Eski Hesar today. In the history page, Eski Hesar Castle is first mentioned in 1241. The castle was restored in 1998. Manuel Comnenus built the inner walls of the castle in the 12th century. The veil walls were built by Emperor Iznik II Dukas Vatatzis in the first quarter of the thirteenth century and the outer walls in the second quarter of the thirteenth century. The castle, which has a wonderful view of the sea.