One of the most significant buildings in Belgrade from a cultural and architectural point of view is the former telephone exchange building, since it was built in a style that before the First World War, was “intended” to mark Belgrade and all the cities of Serbia at the time, as a response to the secession in neighbouring Hungary and Austria, and to world trends that were formed in Germany, France and the United Kingdom. As Art Nouveau derived many elements from medieval tradition and folk creativity, using rich ornamentation, thus opposing the machine and industrial age, so “Serbian Art Nouveau” derived many elements from Serbian medieval art, Serbian folk tradition and Byzantine architecture. In this case, the architects tried to incorporate elements of the Moravian school of Serbian architecture, the most indigenous style in Serbian architecture before the fall to Ottoman slavery. The Moravian style is known for having inserted into the Orthodox, Byzantine tradition elements of Gothic, which flourished in the west, and Armenian architecture, since, due to the occupation of Armenia, numerous refugees, including masons, flooded Europe, including Serbia at the time.