Serbia Aircraft, Coastal + Nature Pictures

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Tour the gates, tunnels, ramparts and museum of this imposing 17th-century citadel, which hosts an annual music and arts festival.

Straddling the shores of the Danube, this welcoming riverside city features a fascinating collection of beaches, parks, pavement cafés and religious landmarks.

Straddling the shores of the Danube, this welcoming riverside city features a fascinating collection of beaches, parks, pavement cafés and religious landmarks.

Wander along the park paths and encounter possibly the world’s largest pride of white lions in one of Europe’s oldest zoos.

Straddling the shores of the Danube, this welcoming riverside city features a fascinating collection of beaches, parks, pavement cafés and religious landmarks.

Straddling the shores of the Danube, this welcoming riverside city features a fascinating collection of beaches, parks, pavement cafés and religious landmarks.

Tour the gates, tunnels, ramparts and museum of this imposing 17th-century citadel, which hosts an annual music and arts festival.

Despite being landlocked, this city has “Belgrade’s Sea,” a popular river retreat featuring a beautiful beach with watersports options.

Despite being landlocked, this city has “Belgrade’s Sea,” a popular river retreat featuring a beautiful beach with watersports options.

Despite being landlocked, this city has “Belgrade’s Sea,” a popular river retreat featuring a beautiful beach with watersports options.

Tour the gates, tunnels, ramparts and museum of this imposing 17th-century citadel, which hosts an annual music and arts festival.

Tour the gates, tunnels, ramparts and museum of this imposing 17th-century citadel, which hosts an annual music and arts festival.

Despite being landlocked, this city has “Belgrade’s Sea,” a popular river retreat featuring a beautiful beach with watersports options.

Despite being landlocked, this city has “Belgrade’s Sea,” a popular river retreat featuring a beautiful beach with watersports options.

Despite being landlocked, this city has “Belgrade’s Sea,” a popular river retreat featuring a beautiful beach with watersports options.

Despite being landlocked, this city has “Belgrade’s Sea,” a popular river retreat featuring a beautiful beach with watersports options.

Tour the gates, tunnels, ramparts and museum of this imposing 17th-century citadel, which hosts an annual music and arts festival.