The Great Barrier Reef stretches along Australia’s northeast coast, forming the largest coral reef system on Earth and one of the planet’s most complex living ecosystems.

Albufeira, perched on Portugal’s Algarve coast, combines the charm of a traditional fishing village with the vibrancy of a seaside resort. Its whitewashed buildings tumble down hillsides toward golden beaches and turquoise waters, creating one of the most picturesque coastal scenes in southern Europe.

This natural reef and its uninhabited islands are home to one of the natural wonders of Belize, the Blue Hole. An underwater shaft that drops from a ten-foot-deep lagoon, it opens into a series of elaborate, stalactite-filled caverns. A true diver's paradise!

One of the most beautiful islands in the Sea of Cortez, with deeply indented shorelines and dramatically eroded cliff faces.

Aoraki / Mount Cook, New Zealand's highest mountain, and the eponymous park that surrounds it, are popular with South Island tourists, especially mountaineers and other adventurers. The only way in or out is State highway 80, which also happens to be one of the country's most scenic roads.