majestic medieval golubac fortress rising dramatically above the danube river in serbia

golubac fortress danube river serbia medieval architecture historical site stone walls ancient ruins travel destination cultural heritage scenic landscapes castle views tourism history fortifications nature adventure sightseeing exploration landmark landscape visigrad outdoors hiking riverside empty sky fort beautiful landmarks natural tower old wall building ruin fortification monument stronghold majestic rising dramatically blend nature#39aph39#s beauty imposing command attention stand resilient backdrop preserving centuries culture