Budapest Cruises, Hungary

Sliced in half by the Danube, Budapest is like two cities in one. Hilly Buda sits to the west of the river, crowned by a vast 18th-century castle and the turreted Fisherman’s Bastion. To the east, you’ve got Pest, which is home to one of the grandest parliament buildings in the world. The whole city’s a treasure chest for architecture, though – even its famous thermal baths are style icons, from Ottoman-era Rudas to canary-yellow Szechenyi and its open-air number. And its quirky ruin bars – housed in derelict, open-air buildings – are anything but ordinary. Go for a drink at Szimpla Kert and you can take a seat in a cut-open car or admire the graffiti-covered walls.