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Kalemegdan Fortress
Belgrade's multi-layer citadel where Roman castrum, Byzantine walls, Ottoman bastions, and Serbian towers are physically stacked—every empire that held this confluence left material traces. The fortress park is the single most visited heritage site in Serbia and makes 2000 years of layered history walkable. Anchor modes: custodian | material_layer | network_route | Search hooks: Kalemegdan Fortress; Belgrade Fortress; Roman castrum Singidunum; Ottoman bastion Belgrade; fortress park Danube confluence
Walk the fortress walls from Roman foundations through Ottoman gates to the Victor monument; visit the military museum, Roman wells, and Ottoman tombs within the park; view the Sava-Danube confluence from the ramparts.