Barcelona is a walkable global city known for breathtaking architecture, world-class museums, bustling markets, parks, and fashion. Start at Montjuïc Castle for city views, then visit the Joan Miró and National Art Museum. Spend a day in the Gothic Quarter and Museu Picasso. The city is especially famous for Antoni Gaudí's work, from La Sagrada Família to Park Güell. Along La Rambla, you'll find more architecture, designer shopping, and great tapas.

Málaga, on the Costa del Sol, blends golden beaches, mild Mediterranean weather and mountain shelter. One of the world's oldest cities, founded 2,800 years ago, it was shaped by Phoenicians, Romans and Moors. Highlights include the Alcazaba, Gibralfaro, 30+ museums, Picasso's museum, Centre Pompidou, lively street art, chic dining and traditional porra antequerana. Nearby white villages add Andalusian charm.

Porto, a compact UNESCO city on both sides of the Douro, is easy to explore on foot. Its Ribeira quarter has cobblestone streets and squares tracing 2,000 years of history. Highlights include the 12th-century Romanesque cathedral, Palácio da Bolsa, and the Beaux-Arts railway station. Cross the Dom Luís I Bridge to taste port wine in nearby cellars, and visit Guimarães, Portugal's first capital, for medieval castles and 15th-century palaces.

Bilbao's most transformative landmark is the Guggenheim Museum, Frank Gehry's titanium-clad 1997 masterpiece, which helped redefine the city's riverfront. Its modern collection is also notable. Other good museums include the Museo de Bellas Artes and the Euskal Museoa, dedicated to Basque culture. For a contrast, explore Casco Viejo's medieval streets, shops, markets, churches like the 14th-century Catedral de Santiago, and stop for pintxos with txakoli wine.

Bordeaux, in southwestern France, is an elegant 18th-century city of stately buildings, broad avenues and historic squares. Highlights include Porte de Bourgogne, Bordeaux Cathedral's stained glass, the 12th-century Romanesque basilica, and Hôtel de Ville. But a visit isn't complete without wine: this region is known worldwide for appellations like Pauillac, St. Emilion, Margaux and Sauternes. Tour a wine chateau to see grapes grown, aged in oak barrels and processed.

Bordeaux, in southwestern France, is an elegant 18th-century city of stately buildings, broad avenues and historic squares. Highlights include Porte de Bourgogne, Bordeaux Cathedral's stained glass, the 12th-century Romanesque basilica, and Hôtel de Ville. But a visit isn't complete without wine: this region is known worldwide for appellations like Pauillac, St. Emilion, Margaux and Sauternes. Tour a wine chateau to see grapes grown, aged in oak barrels and processed.

On Normandy's northern edge, Cherbourg is a heritage port with a vast harbor that once sheltered Napoleon's navy. Its story comes alive at Cité de la Mer, with submarines, aquariums, and maritime galleries. Spend the morning there, then explore cobbled lanes and markets scented with cheese and cider before oysters at a Belle Époque brasserie. For remembrance, the D-Day beaches, including Utah and Omaha, are just over an hour away.

London blends history and modernity. See the Changing of the Guard at Buckingham Palace, Westminster, Parliament and Big Ben, then the London Eye over the Thames. UNESCO sites include Westminster Abbey, the Tower of London, and Greenwich. Art lovers should visit the British Museum, National Gallery, and Tate Modern. For local flavor, explore Camden and Notting Hill markets, Shoreditch cafés and galleries, or Mayfair boutiques.