Known for walkable urban villages like Crystal City, Rosslyn and Ballston, Arlington was part of the "10 miles square" surveyed in 1791 to be the United States capital. Just across the Potomac from Washington, Arlington is home to the Pentagon, Arlington National Cemetery, the Marine Corps War Memorial (Iwo Jima), Air Force Memorial and Pentagon Memorial. With 11 Metro stops, Arlington is car-optional and offers visitors everything from eclectic theater to Bohemian cafes.

With depths reaching 700 feet and a length of more than 20 miles, Loch Ness provides plenty of hiding places for its legendary monster. Should you tire of searching for Nessie, this scenic section of the Scottish Highlands also delivers charming villages like Drumnadrochit and Fort Augustus, open-air Shakespearean productions, multiple golf courses and medieval Urquhart Castle. Wildlife of the non-mythological variety and ancient Caledonian pine forests can be found in the Glen Affric nature reserve.

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.

A patchwork of vineyards and olive groves, dotted with whitewashed hill towns and sun-bronzed beaches—Italy’s southern heel has no shortage of photogenic landscapes. There are a few surprises, too, including the baroque city of Lecce and the Itria Valley, with its UNESCO-listed trulli houses.