Despot Stefan Tower

The Despot Stefan Tower (Serbian: Деспотова кула; Despotova kula) or Dizdar Tower (Диздарева кула; Dizdareva kula) is a structure in Belgrade, Serbia, built ca. 1405, a couple of years after the city became the capital of Serbian Despotate under Despot Stefan Lazarević.

Today, the tower is the seat of the Astronomical Society Ruđer Bošković and houses its Popular Observatory. The Observatory has two instruments: refractor Zeiss (110/2200mm) and reflector Tall 200 K (200/2200mm), both of which are used mainly for observations at night. Four panoramic telescopes are also mounted on the tower, which can be used to observe the panorama of Belgrade.