Belgrade Fortress and Kalemegdan

Belgrade's oldest landmark sits on the ridge where the Sava flows into the Danube. The fortress and the Kalemegdan park around it cover more than 60 hectares, are protected as a cultural monument of exceptional importance and draw about two million visitors a year, according to the managing company.

Walk in through the gates and towers, look for the Victor monument on the upper town's edge and keep going for the views over the rivers and New Belgrade. The grounds also hold exhibitions and events through the year. Dress for a lot of walking on cobbles and old stone, and go around sunset.