Калемегдан
The Belgrade Grand Prix is a former grand prix from the Grand Prix motor racing era - precursor to Formula One. It was held on the streets of Belgrade, the capital of Yugoslavia (today Serbia). Only one championship event was held, on 3 September 1939. This race saw 5 drivers take part - two Mercedes-Benz in their Silver Arrows, two Auto Unions (modern Audi) and a Bugatti, which finished 19 laps down - and was won by Tazio Nuvolari. The Kalemegdan Park circuit is no longer operational.