adapted for the tourists and opened in December 2012. It has parts of the authentic inventory from the 1950s: safety doors, beds, ventilation, water tanks, etc. Origin The present Nebojša Tower was built c.1460 by the Hungarians, who ruled Belgrade at the time. When it was built, it was located at the entrance into the city's "Danube port", in the Lower Town of the fortress and was part of the defense system which was protecting Belgrade from the Ottoman invasion after the Siege of Belgrade in 1456. During the 1521 Siege of Belgrade, cannons from the tower successfully defended the city from July to August, until the Ottomans managed to set the tower on fire. Only then, they managed to conquer the city. One chronicler of the siege wrote: "In the lower fortification of Belgrade on the Danube towards Mustafa–pasha position there was a tower. That tower was used as a stronghold by the faithless (Christians). It prevented assault. When assault was made yesterday many of them were killed by canons from the tower. After destruction that tower was put on fire today by a vanquisher. The faithless were beaten up and gave in. From the position of Mustafa-pasha an opportunity for assault was thus created." The sultan Suleiman the Magnificent ordered for the tower to be rebuilt. 18th century After Austrians reconquered Belgrade as part of their rule of northern Serbia 1718-39, they began a massive reconstruction of the fortress as they envisioned Belgrade as the typical fortified baroque city of the day and the foothold of their further military operations against the Ottomans. Belgrade Fortress was reconstructed and the new bastion fortifications were built. In that period, the Nebojša Tower was also reconstructed. The old, upper part of the tower was lowered and a new floor with the vault was built. Old embrasures were walled up and the new, larger ones were opened to fit the modern, bigger cannons. At that time, the inner, war port, which was protected by the tower, still existed. In c.1725 Austrians built an arsenal at the base of the tower. It was used for cannon casting by the Serbian rebels 1807-1813, headed by Karađorđe, during the First Serbian Uprising. Dungeon After regaining Belgrade in 1739, the Ottomans closed and covered the port with earth so the tower lost its military importance and was turned into the dungeon. Due to the terrible conditions