Did you know that a desert doesn't have to be hot or sandy? In fact, many of the world's harshest deserts are freezing cold. There are about 33 central deserts worldwide. They cover one-fifth of the ...

Snow crunches underfoot. The air is thin, sharp and silent. Mountains rise like walls on all sides, their peaks dusted white even in summer. A river cuts through a wide, open valley. Nothing about ...

When you think of deserts, you might envision isolated wastelands confined to single nations. Yet the world's most massive arid regions defy political boundaries, sprawling across continents and ...