Belgrade's Aeronautical Museum is worth noticing before you even get inside: its glassy, futuristic building sits near the airport and feels like a relic of Yugoslav modernism. The aircraft collection covers military and civil aviation from the region and beyond.
It is far from the historic centre, so it works best on the way to or from the airport, or as a deliberate outing for aviation enthusiasts. The combination of aircraft, Cold War history, and architecture gives it broader appeal than a standard transport museum.