Europe

Zagreb is made for strolling. Wander through the Upper Town's red-roof and cobblestone glory, peppered with church spires. Crane your neck to see the domes and ornate upper-floor frippery of the Lower Town's mash-up of secessionist, neo-baroque and art deco buildings.

During any season, at any hour of the day, Moscow thrills visitors with its artistry, history and majesty. The very founding site of the city (and arguably, the country), the Kremlin and Red Square are still at the heart of Moscow – historically, geographically and spiritually.

Barcelona is an enchanting seaside city with boundless culture, fabled architecture and a world-class drinking and dining scene. Towering temple columns, ancient city walls and subterranean stone corridors provide a window into Roman-era Barcino.