Belgrade; Serbia: National Theatre at Republic Square; built 1867 - 1869; detail of cupola; background Republic Square (Trg Republike); city of Belgrade (Serbia); The main square of Belgrade once was the open space (and execution place) in front of Stambol Gate; the main city gate that let to Istanbul. After demolition of the gate; the National Theatre was erected 1867 - 1869. The monument fort Prince Mihailo Obrenovic was unveiled; in 1882. In 1903; the building of the National Bank took place. Today; it houses the National Museum.