 The Golubac Fortress ( Serbian : Голубачки град or Golubački grad , Hungarian : Galambóc vára , Bulgarian : Гълъбец , Romanian : Cetatea Golubăț , Turkish : Güvercinlik Kalesi ) was a medieval fortified town on the south side of the Danube River , 4 km downstream from the modern @-@ day town of Golubac , Serbia . The fortress , which was most likely built during the 14th century , is split into three compounds which were built in stages . It has ten towers , most of which started square , and several of which received many @-@ sided reinforcements with the advent of firearms . 
