Golubac Fortress

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.

• http://en.wikipedia.org/wiki/Golubac Fortress