Phoenix, the vibrant capital of Arizona, basks in a sun-drenched paradise known for its warm climate year-round, with summer temperatures often exceeding 100°F (~38°C)—the dry heat makes it more bearable though. The city is also the most populous state capital in the U.S., which translates to a richly diverse collection of cultures and activities. And perhaps most spectacularly, every drive or stroll through the city is accompanied by a backdrop of the Sonoran Desert, sandy mountain ranges, and eternal blue skies.

White beaches, turquoise waters, and lively nightlife — these are images Bridgetown, the capital of the Caribbean island of Barbados, likely conjures up in the minds of most. But Bridgetown is so much more! There's the colonial heritage — its entire downtown is on the UNESCO list, after all — lush forests right outside city limits and an abundance of local and international shopping options. An animated buzz sets in as the sun goes down, inviting one to join the famously laid-back and welcoming Bajans on a night out.

Capital of one the world's fastest-growing economies, Addis Ababa (also spelled Addis Abeba) is a city in motion, catching up to Ethiopia's zooming commercial development in stride. At times gauche and somewhat rough around the edges, it is nonetheless worth more than a single night in transit, if only for the country's finest dining, shopping and of-the-moment urban developments.

As the capital of the north, Groningen has its fair share of cultural and historical treasures, interwoven by inviting parks and scattered patches of water. This varied landscape is made even more exciting by the student atmosphere, which manifests itself in an exciting bar and café scene.