Kalemegdan fortressBelgrade
The Belgrade fort itself (split into the Lower and Upper towns) and the surrounding area (the Kalemegdan park) are located on the point where the river Sava flows into the Danube.
Ancient fortress Singidunum
The oldest parts of Belgrade Fortress Kalemegdan date back to the first century AD, when it served as permanent Roman military camp. The Belgrade fort itself (split into the Lower and Upper towns) and the surrounding area (the Kalemegdan park) are located on the point where the river Sava flows into the Danube.