In the heart of Calanques National Park, Cassis offers visitors a glimpse of life in a quaint Provencal fishing village. Hop on a sightseeing boat to experience the Cassis Calanques by water, or enjoy the turquoise coastline from a pebble beach. There’s much to explore by foot, too. Admire the pastel-colored houses lining the picturesque harbor, drift into the village’s charming shops and cafes, and take in the scenic views of the French Riviera from the many vantage points along the way.

Aix, a graceful, lively city, is known for its thermal hot springs, art schools and universities. Wander the Cours, old town and Quartier Mazarin on foot, stopping at cafés, bookstores and markets. Kids whining? Have them count fountains… Aix reportedly has 1,000 of them.

Provence in southeastern France is divided into six departments and stretches from Orange to Nice. Many consider the Luberon in Vaucluse to be the "real Provence." Gently sloping vineyards and lavender fields are the backdrops that enthralled Cezanne, Van Gogh and Chagall. An excellent train network makes travel between cities easy. To explore villages, drive or catch a bus. Particular highlights include Palace of the Popes at Avignon, the Roman amphitheatre at Arles and the craft center of Les Baux.

Avignon charms visitors with its ancient streets, restored medieval ramparts and the immense Gothic architecture of the Palais des Papes (Palace of Popes—the papacy was based here in the 14th century). The annual Festival d'Avignon, a major arts festival, attracts hundreds of thousands of visitors for theater, dance, film and street performances.

Barcelona feels a bit surreal – appropriate, since Salvador Dali spent time here and Spanish Catalan architect Antoni Gaudí designed several of the city’s buildings. Stepping into Gaudí’s Church of the Sacred Family is a bit like falling through the looking glass - a journey that you can continue with a visit to Park Güell. Sip sangria at a sidewalk café in Las Ramblas while watching flamboyant street performers, then create your own moveable feast by floating from tapas bar to tapas bar.

Rome wasn't built in a day--and you'll need much more than a day to take in this timeless city. The city is a real-life collage of piazzas, open-air markets, and astonishing historic sites. Toss a coin into the Trevi Fountain, contemplate the Colosseum and the Pantheon, and sample a perfect espresso or gelato before spending an afternoon shopping at the Campo de’Fiori or Via Veneto. Enjoy some of the most memorable meals of your life here, too, from fresh pasta to succulent fried artichokes or a tender oxtail stew.

Lingering over pain au chocolat in a sidewalk café, relaxing after a day of strolling along the Seine and marveling at icons like the Eiffel Tower and the Arc de Triomphe… the perfect Paris experience combines leisure and liveliness with enough time to savor both an exquisite meal and exhibits at the Louvre. Awaken your spirit at Notre Dame, bargain hunt at the Marché aux Puces de Montreuil or for goodies at the Marché Biologique Raspail, then cap it all off with a risqué show at the Moulin Rouge.

So many of Madrid’s buildings look like castles, you’ll think you’ve stumbled into a fairytale. Even City Hall is astounding, with its white pinnacles and neo-Gothic features. A self-guided architecture tour can begin by the great bear statue in the central Puerta del Sol. Wander by the fanciful Royal Palace before absorbing the natural beauty of Retiro Park, then visit one of the city’s many museums. You could happily cap off each day by nibbling on forkfuls of paella while sipping Spanish rioja.

From Shoreditch’s swaggering style to Camden’s punky vibe and chic Portobello Road, London is many worlds in one. The city’s energy means that no two days are the same. Explore royal or historic sites, tick off landmarks from your bucket list, eat and drink in exclusive Michelin-starred restaurants, enjoy a pint in a traditional pub, or get lost down winding cobbled streets and see what you stumble across – when it comes to London, the possibilities are endless.

This city, full of colorful homes, canals and bridges, is one of Europe's most picturesque capitals. Must-sees on any visitor's itinerary include the Anne Frank House, the Van Gogh Museum and the world's only floating flower market. Rent a bike and join thousands of locals navigating Amsterdam's labyrinthine streets, or just take in the sights on foot. For an unusual and memorable alternative to hotels, consider staying in a houseboat.

Over the centuries, many cultures have added their mark to this prized piece of land. Today, you can experience those influences firsthand by exploring Istanbul’s mahalles (neighborhoods). From the holy sites of Sultanahmet and the 19th-century European elegance of Beyoğlu to the high fashion of Nişantaşı, the vibrant café society of Kadıköy and the football-loving streets of Beşiktaş, it’s easy to see why travelers say that Istanbul isn’t just one city, but many cities within one.

The shining jewel of Qatar, Doha is a multicultural city, home to most of the country's population as well as expatriate communities from a range of origins. Shopping abounds in the city's plentiful malls, while the Corniche impresses visitors with picturesque architecture and dazzling views of the harbor. Doha boasts myriad cultural facilities, including the futuristic Education City and the National Museum.

Dubai is a destination that mixes modern culture with history, adventure with world-class shopping and entertainment. Catch a show at the Dubai Opera, see downtown from atop the Burj Khalifa and spend an afternoon along Dubai Creek exploring the gold, textile and spice souks. If you’re looking for thrills, you can float above the desert dunes in a hot air balloon, climb aboard a high-speed ride at IMG Worlds of Adventure or skydive over the Palm Jumeirah.

Conquering New York in one visit is impossible. Instead, hit the must-sees – the Empire State Building, the Statue of Liberty, Central Park, the Metropolitan Museum of Art – and then explore off the beaten path with visits to The Cloisters or one of the city’s libraries. Indulge in the bohemian shops of the West Village or the fine dining of the Upper West Side. The bustling marketplace inside of Grand Central Station gives you a literal taste of the best the city has to offer.