Düzce Castle is a historical fortress located in the city of Düzce, Turkey. It was built during the Byzantine period and later expanded by the Ottomans. The castle is situated on a hill, providing a strategic view of the surrounding area. The structure features thick stone walls and several towers, which have withstood the test of time. Today, Düzce Castle serves as a popular tourist attraction, offering visitors a glimpse into the region's rich history and stunning panoramic views of the landscape.