Overlooking the glittering waters of the Adriatic Sea, Dubrovnik is the dazzling jewel of Croatia's coastline.

Its walls were designed to be indestructible, a human-made rock face more than 80 feet high and up to 20 feet thick. These days, they don't do so well in repelling advances, as cruise ships passengers and overnight visitors arrive en masse to experience one of Europe's most spectacular walled cities, dating back to the seventh century. Walk atop the walls to get your bearings and gaze out over a sea of terracotta tiles before getting lost in Dubronik's winding alleyways. At some point, you'll find yourself in front of the ornate carved masks that adorn Onofrio's Fountains, the graceful arches of the Sponza Palace, or the 15th-century Gothic-Renaissance Rector's Palace, which hosts the city's Cultural History Museum. A word of advice: Come in the off-season (November to February) if you want a bit of breathing space.

6 Things You Should Never Do in an Airport

With hordes of travelers, long lines at check-in, and rising prices for just about everything, traveling through an airport can certainly be a headache. From the time you arrive at the ticket counter until you board your plane at the gate, you'll want to avoid these six top mistakes to ensure smooth travels.

These Are the World's Closest Capital Cities

We tend to think of world capitals as being far away from one another, and most of them are. However, there are some notable exceptions that are surprisingly close to each other. Here are the world's closest capital cities.