If you visit Honolulu simply for the wide Pacific beaches, the striking views of Ko'olau's pali (cliffs) and the laid-back "aloha" feeling, you'll be missing out on much this city has to offer.

With its ultramodern skyline, it's easy to forget that Dubai, part of the United Arab Emirates, was once a small town of Bedouin traders.

This resort community is known for its bright white beaches and soothing warm water. Daytime activities include scenic cruises, dolphin-watching and hiking.

Historic and modern, European and Asian — that's Istanbul. The city at the junction of two continents is home to ancient structures like the Hagia Sophia and the Blue Mosque in the Old City, as well as modern businesses, hotels, restaurants and nightlife in the New City.