Visit Šibenik

Explore Carcassonne, a fortified medieval city in southern France. Walk the double ring of ramparts of the Cité de Carcassonne (a UNESCO World Heritage site with 52 towers), admire the Basilica of Saints Nazarius and Celsus (known for its 12th-century stained glass and Gothic choir), and cross the Pont Vieux (a 14th-century stone bridge offering panoramic views of the city).

Visit Split, Croatia's second-largest city, built around the Roman Emperor Diocletian's Palace (a UNESCO World Heritage site with ancient cellars and a peristyle). Walk along the Riva waterfront promenade, climb Marjan Hill for panoramic views of the Adriatic Sea, and explore the Cathedral of Saint Domnius (originally Diocletian's mausoleum, one of the oldest Catholic cathedrals in the world).

Visit Dubrovnik, a historic coastal city in Croatia. Walk the ancient city walls (2 km long with views of the Adriatic Sea and red-tiled roofs), explore the Stradun (main limestone-paved street lined with Baroque buildings), and see the Rector's Palace (Gothic-Renaissance palace housing a cultural history museum). Take a cable car up Mount Srđ for panoramic vistas over the Old Town and Elaphiti Islands.

Roman forum, Romanesque churches and the Sea Organ — steps that play music from the waves — on a Dalmatian peninsula.

One of the six largest Roman amphitheatres, still hosting concerts and film festivals.

The port city, European Capital of Culture 2020, with the Trsat castle and the Rijeka carnival.

A herringbone-planned walled town said to be Marco Polo's birthplace, with the Moreska sword dance.

Red-sandstone castle ruin above the old town of Heidelberg and the Neckar valley.