Pustý hrad is a castle whose ruins are located on a forested hill in the southern part of Zvolen in central Slovakia. With an area of 76,000 m² it is arguably one of the largest medieval castles in Europe. The original name was Zvolen Castle or Old Zvolen; Pustý hrad is a much later name used to distinguish the ruin from the present-day Zvolen Castle. Pustý hrad consists of two parts, the Upper Castle and the Lower Castle.
The strategic hill site upon the river Hron attracted settlers as early as the late Stone Age. A stone-earth wall discovered in 2009 under the western line of medieval fortification included shreds of pottery from the late Stone Age inside its filling. Research carried out at the Upper Castle in 1992–2008 by Václav Hanuliak also identified stone walls built during the Bronze Age and the Iron Age.
Address 96001, Slovakia
Coordinates 48°33'24.456" N 19°6'32.548" E