is one of the largest and best preserved Roman forts on this section of the Danubian Limes. It was built by the emperor Trajan at the beginning of the 2nd century BC and was destroyed by the joint attack of the Slavs and Pannonian Avars in the 6th century. During the Ottoman occupation of the Balkan peninsula a fortress was built near the town. It was named Fetislam (originally Feht-ul-Islam meaning "gate of Islam") and it is located upstream of Kladovo's downtown. Construction began in 1524 and the present look of Fetislam dates from the period of Suleiman the Magnificent in the mid 16th century. The construction was supervised by Malkoçoğlu Balı Bey, while the architect was Osman Pasha. It consists of "Big Town" and "Little Town", which represent two levels of the fortress' defense. It was very important for the Ottomans as, due to its location, domineered the Iron Gate gorge. Fetislam has round, two-storeys high towers. The rectangular cannon fortification with six round bastions, Fetislam became important military structure up to the end of World War I. It was damaged in World War II and by the neglect after the war. In 1968 conversion into the sport complex slowly began and it was partially renovated in 1973, including the amphitheater. The fortress was endangered with the rise of the Danube water level with the construction of the massive Iron Gate dam. Today, it contains children's playgrounds, track and soccer fields, handball, volleyball and tennis courts. The Đerdap national park offers scenic views, excellent hunting grounds, and many trails for hiking (most trails are not well marked or maintained, so hiking is recommended only for the experienced). The town has two hotels: "Đerdap" and "Aquastar Danube". Nearby the city (8 km on the road to Belgrade) there is a youth camp named "Karataš" (Turkish kara-tash for "black stone") which can host some of the visiting tourists. Kladovo has many cafés and restaurants, some offering live music entertainment late into the night. The town's quay stretches about along the Danube river and is used for walking and cycling. Kladovo has a beach, Đerdap Archaeology Museum, Orthodox Church of Saint George and a pedestrian zone (Kladovo Skadarlija). Kladovo is on the European bicycle path and in 2016 about 16,000 cyclists passed through the town. As of 2017, the bus line Belgrade-Kladovo was the only one in Serbia which had bicycle carriers