The Rub' al Khali, meaning 'Empty Quarter' in Arabic, is a vast sea of sand. Spreading across 250,000 sq. Spreading across 250,000 square miles, it's the largest area of continuous sand in the world, ...

Though the coastal Namib Desert begins in the southwest of Angola and creeps into South Africa, t Though the coastal Namib Desert begins in the southwest of Angola and creeps into South Africa, the ...

Our image features a waterline view of an ice floe in Admiralty Inlet off the west coast of Baffin Island. T Our image features a waterline view of an ice floe in Admiralty Inlet off the west coast of ...

National parks abound in Alajuela, an ecologically rich province in northern Costa Rica. And within tho.. See more ...

Sea otter in Alaska© nvphoto / Shutterstock ...

Like nearly every structure in the ancient city of Petra, Ad Deir was carved directly into the sandstone cliff.. See more ...

Hamilton's Gap, New Zealand© Ingram Publishing/SuperStock ...

Perhaps pausing during its lunch hour, our friend is peering at us over the thorned stems of an acacia tree Perhaps pausing during its lunch hour, our friend is peering at us over the thorned stems of ...

Amboseli National Park in Kenya is one of the best places in the world where you can still see African e.. See more ...

A remote area of the Kazakh steppe, Mangystau is a region of contrasts, where desert colors and erode.. See more ...

It's hard to fathom the forces of wind and water that created this elephantine formation, especially in thIt's hard to fathom the forces of wind and water that created this elephantine formation, ...

Roughly 26,000 acres of cloud forest are protected in an extraordinary nature reserve in northern Costa R.. See more ...