After breakfast, drive to a small city of Sremski Karlovci, which was a Serbian spiritual and cultural capital for 200 years. The town has traditionally been known as the seat of the Serbian Orthodox Church in the Habsburg Monarchy and the political and cultural capital of Serbian Vojvodina. The old baroque town is surrounded by some of the most important monuments of Serbian cultural history: the Cathedral of St. Nicholas, Patriarchy court. Next, we will stop in one of the local wine cellars for wine tasting. Then, you will continue to Novi Sad, the second-largest city in Serbia, visit the Petrovaradin fortress, the most important city landmark, which the Austrians built, to protect the city against the Turks, towering over the Danube on a 40m-high volcanic slab, nicknamed 'Gibraltar on the Danube' and actually built by slaves between 1692 and 1780. Transfer to Belgrade overnight.