Kosančićev Venac is an area in the city center near the main touristic spots, Kalemegdan fortress and Knez Mihajlova street, but it is not so popular. You should visit it since Kosanćićev Venac represents Belgrade as it was in the 19th century, at the end of the Turkish rule. Most of the buildings are from that period and the streets are made of cobblestone. The street and the whole area are nice for walking and there is a great view over the Sava river and New Belgrade. At the beginning of the street, you will see the ruins of the National Library which was destroyed in WWII during the German bombing.
Skica café is at the end of the street and they have a few tables outside looking over the Sava river. If you go further, you will reach Velike stepenice (big stairs) street, which leads to Sava river and Beton Hala, a trendy restaurant and clubbing place.
On the edge of this area, there are important historical buildings, e.g. Princess Ljubica’s Residence, the Cathedral of St. Michael the Archangel, the Building of the Patriarchate of Serbian Orthodox church and the Museum of Serbian Orthodox church.