Best known as the capital of Charlemagne's Frankish empire, today's Aachen sits at the juncture where Germany meets the Netherlands (the Dutch know it as Aken) and Belgium (where "Walloons" call it Aix-la-Chapelle). But Aachen's history goes back even further than 8th-century Charlemagne. Roman soldiers dating back to the 1st century AD cherished its hot springs (as did Charlemagne, who loved a good spa day just as much as the next guy). Aachen Cathedral, northern Europe's oldest and a UNESCO World Heritage Site, is the city's main attraction.

A smorgasbord of flavors come from this lofty land in the hilly southeast of Belgium: game, wild boar, venison, smoked ham, the region's famous paté and world-renowned Trappist beers. Primarily located in Belgium, the Ardennes mountains also nudge into France and Luxembourg. Dense forests flank the steep hillsides, and market towns and villages perch on river banks. Spring and summer show this lush area at its best, but cross country skiing opportunities make a good case for winter visits.

Unassuming Brussels is the capital of Belgium, Flanders and Europe. Medieval Grand-Place, is indeed grand, with many 17th-century buildings and daily flower markets. Reopened in 2006, the Atomium, Brussels' Eiffel Tower, provides great views, inside and out. Architecture fans should visit Musee Horta, home of Belgian master architect Victor Horta. St. Gery's clubs and bars are packed year-round. Seafood eateries abound in Ste. Catherine. Walk, rather than get snarled up in traffic, in the narrow streets.

Eindhoven is one of the oldest cities in the Netherlands, but you’d never know it from the high-tech industry and cutting-edge design it’s currently known for. If you have kids obsessed by all things wheeled, they will love the trucks at the DAF Museum.

There are 2,000 years of history in Cologne, and visitors here will find everything from Roman towers to Gothic churches to fine examples of modern architecture. Cologne has a variety of museums, too—check out the Museum of Applied Art, the Museum Ludwig and, if you have a sweet tooth, the Chocolate Museum. Be forewarned, though—the gift shop at the latter will utterly ruin your diet.

Lively Antwerp is a hidden gem. Its medieval streets, Renaissance monuments and vibrant nightlife tend to be overshadowed by its reputation as center of the diamond trade and as the world's fifth-largest port. Biking is a popular choice for getting around this stylish Flemish city. See thousands of Old Masters at the Royal Museum and Rubens House. Experience the bustle of life at the Grote Markt. Marvel at the art and architecture of the still unfinished Cathedral of Our Lady, started in 1351.

The capital of North Rhine-Westphalia, Dusseldorf is a regional economic powerhouse straddling the banks of the Rhine River. Altstadt is not just Dusseldorf's lovely old town, but also where the city's nightlife is based and where Altbier, its native dark beer, is plentiful. Dusselforfians take their beer seriously. Königsallee (Ko to the locals), Dusseldorf's famous shopping street, has many high-end stores. And the Museum Kunst Palast has one of the Rhineland's best art collections.

A captivating contrast of old and new, Luxembourg City's past is celebrated by its World Heritage status; its present sway by its position as headquarters for several significant European institutions. Small enough to explore on foot, this compact city offers a wealth of attractions, including dramatic promontory The Bock, underground passages in Petrusse Casemates, Palace of the Grand Dukes and the National Museum. Countless banks on Boulevard Royal, once a fortress moat, hint at the duchy's wealth.

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.

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.

One of the most popular resort towns on the Italian Riviera, little Portofino has just over 500 permanent residents. But that all changes on summer days when the sun is shining and the yachting set drops anchor in the harbor to wander about. Boutiques, art galleries, cafes and restaurants line the tiny streets. Diving, hiking and beach-going are popular local pastimes, and there are even some historic sights like the Church of St. Martin (Divo Martino) and the Castello Brown hilltop fortress.

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.

Brigitte Bardot frolicked on the beaches of St. Tropez in the '50s; now it's the playground of rap stars and international socialites. Most of the sandy hot spots lie southwest of town on the Baie de Pampelonne. But if you're not P. Diddy, take heart: you'll find a few family-friendly, public beaches where the sun, sand and waves are just as fabulous.

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.

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.

The holy city of Rishikesh, in the base of the Himalayas, holds deep cultural and spiritual significance for local Hindus. Sacred rivers and mountains set the scene for yoga and reflective hikes, and rafting here is an absolute must. The Beatles got in touch with their Eastern spiritual side here, writing several songs during a 1968 stint at a local ashram.