Landlocked but by no means limited, Tennessee boasts Graceland and Sun Records in Memphis, and the Grand Ole Opry in Nashville. River cruises are becoming increasingly popular here, with Memphis being a key itinerary point on the Mississippi River.

Evidence of our nation's birth abounds in Boston, a hub of revolution that is essentially the oldest city in the United States. Visitors are compelled to walk the 2.5-mile Freedom Trail around the city center, and bear witness to 16 historical locations related to the history of America.

Considered by yachting fans to be among the most beautiful sea lanes in the world, the Whitsunday Islands are a tropical paradise. Crystal clear waters gently lap shimmering white beaches and alluring hide-away coves trim the island's shores. Whitsunday Island National Park's 74 islets are the South Pacific at its most seductive, appealing to anglers, divers, nature lovers and all those content to immerse themselves in a daydream come true.

The Gulf of Oman is a region of diverse landscapes and rich history. Stretching between the coasts of Oman, the United Arab Emirates, and Iran, this gulf is lined with stunning shorelines, port cities, and hidden natural gems.

Puerto Rico is a colorful and invincible archipelago. This U.S. territory, irrevocably shaped by colonialism and dramatic weather events, is awash in culture, with much to be learned in its art galleries and its centuries-old citadels. Capital city San Juan is the largest city and tourism hub. Visitors should see Old San Juan, the inviting beaches, and Museo de Arte de Ponce, among the finest art museums in the Caribbean.