Eastern Serbia compresses the Đerdap Iron Gates gorge along the Danube, the Roman Gamzigrad palace at Felix Romuliana, and the Ćele Kula tower of skulls outside Niš into a corner few visitors reach.
Đerdap National Park walking trails clear, Danube cruise season opening, and Niš's Mediana archaeological site at peak photogenic.
Niš hits 35°C, Đerdap gorge offers river-cooled air, and the Niš Nišville Jazz Festival in mid-August fills the Tvrđava fortress.
Đerdap autumn colour through October, vineyards around Negotin at harvest, and Pirot's traditional carpet workshops accessible without summer heat.
Cold continental winters with Stara Planina ski runs near Knjaževac, and Niš's Roman ruins atmospheric in winter mist with kafanas and grilled meat warming the days.