Golubac Fortress - Day Trip from Belgrade, Serbia davidsbeenhere.com David's Been Here is touring all the top sites and must-visit attractions of Serbia. In this short video, David brings us along the Danube River to the Golubac Fortress. An hour and a half drive east from the capital city of Belgrade, this 14th century castle is one of the country's most remarkable attractions. Take the beautiful day trip from Belgrade along the Danube River, passing along and even through the walls of this medieval fortification. Soak in the ancient atmosphere, stunning scenery and clear views of Romania across the river for an awesome half-day experience.