do you know who designed it?
Aleksandar Bugarski
National Theatre in Belgrade
design of Aleksandar Bugarski, the most productive architect of Belgrade in the 19th century. 
where is belgrade? Serbia which museums are there? National Museum what kind of weather do they have? Humid subtropical climate which tourist spots are worth visiting? Skadarlija, the National Museum, National Theatre, Zemun, Nikola Pašić Square, Terazije, Students' Square, the Kalemegdan Fortress etc. please tell me what the fourth place is A municipality of the city of Belgrade when was the third place built? in 1868
wiki:10580475
National Theatre in Belgrade [SEP] History
Though some preparatory works have begun, the prince didn't live to see the full blown construction. He was assassinated in Košutnjak on 10 June 1868 and the foundation stone was laid by his successor, prince Milan, on 31 August 1868. On that day the Metropolitanate of Belgrade Mihailo Jovanović consecrated the foundations. The building was roofed the next January and ceremonially opened on 12 November 1869. The National Theatre was built according to the design of Aleksandar Bugarski, the most productive architect of Belgrade in the 19th century. The building was a typical theatre building at the time and was particularly reminiscent of La Scala, in Milan, with regard to its Renaissance conception and the decorative finish.