Petrovaradin Fortress

Petrovaradin Fortress overlooks Novi Sad from a rock above the Danube, built by the Austrians in the eighteenth century on earlier fortifications. Sixteen kilometres of underground tunnels served as barracks, magazines, and siege shelters. The fortress clock tower's minute and hour hands are famously reversed.

The underground tunnels are the focus of paranormal reports: voices in German and Turkish, footsteps behind tour groups, and cold spots in sealed ammunition chambers. The vast tunnel network means most of it remains unvisited, adding to the sense that something persists in the darkness below.

The fortress is open year-round and hosts the EXIT music festival in summer. Underground tunnel tours are offered seasonally. The Danube views from the ramparts are excellent. Novi Sad is accessible from Belgrade by road and rail.

Open year-round with free access to ramparts and upper fortress. Underground tunnel tours offered seasonally — check availability locally. Hosts the EXIT music festival in summer. Accessible from Belgrade by road and rail. The fortress contains restaurants, galleries, and a hotel.