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, ...

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 favorite foods. There’s plenty more where that came from, and lots of room for a young ...

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 th.. See more ...

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