The Belgrade Metro is a planned rapid transit system in Belgrade, Serbia currently under construction. The construction of the full metro system has been delayed repeatedly, mostly due to lack of funding. Construction of the first line began on 22 November 2021.

The Kalemegdan Park, or simply Kalemegdan is the largest park and the most important historical monument in Belgrade. It is located on a 125-metre-high (410 ft) cliff, at the junction of the River Sava and the Danube.