After the first world war, Belgrade became the capital of the Kingdom of Serbs, Croats, and Slovenes (renamed the Kingdom of Yugoslavia in 1929). During this period, the city experienced a rapid grown and modernization. Belgrades population grew to 239,00 by 1931, and averaged 4% per year. In 1927 Belgrades first airport opened.
The University of Belgrade
A view of the Cathedral in Belgrade