Nestled along the banks of the Danube River, this Serbian city is quickly establishing itself as a culture capital in Europe. Gradić Fest takes place in late Summer, where for three days, the streets come to life with music, theatre, and art performances, along with film projections and exhibitions. Serbia's second largest city also hosts the award-winning EXIT festival, bringing together an eclectic mix of indie, rock, and electronic musicians to rock out at the historic Petrovaradin Fortress.