Belgrade Zoo 🐯

Beo zoo vrt (Serbian: Бео зоо врт), also known as Vrt dobre nade (Garden of good hope), is located in Kalemegdan Park, downtown of Belgrade. Considered to be one of the oldest public zoos in southeastern Europe, it was founded in 1936 and is the biggest zoo in the country. The zoo covers an area of 7 hectares (17 acres) and holds about 1,700 animals representing more than 150 different exotic species, as well as domestic and indigenous ones. en.wikipedia.org/wiki/Belgrade_Zoo

Very beautiful with a huge number of animals, which you can come quite close to

Also some nice restaurants available

Agree, one of the most unique settings for the Zoo that I ever saw. Embedded in to the ancient Kalemegdan castle. Very cool.
Restaurant patio is above the tigers and lions den so you don't want to drop anything down.