Belgrade, a fantastic city to visit. Affordable food of excellent quality, friendly people, and FREE PUBLIC TRANSPORT FOR EVERYONE, so you can explore the whole city at no cost.
I have also uploaded photos from Golubac Fortress, about 2 hours away from Belgrade. I would recommend taking the local road so you can pass through villages and experience rural life, with roadside markets and farmers along the way. Absolutely amazing.
Greetings from Greece!