Joshua Tree National Park is one of the busiest climbing areas in the United States, and the numbers explain why.

Most ice climbing starts with a long approach on snow to a frozen waterfall that may or may not be

Hood River, on the Oregon side of the Columbia River Gorge, is one of the best known wind sports towns

A river wave does not break and roll toward a beach. It stands still while the water rushes through it,

Sandboarding looks like snowboarding on a beach holiday, and the first run usually proves otherwise. Sand is slower than snow,

A sea cave is the one kind of cave you enter without leaving daylight behind entirely. The mouth stays visible,

Most fireflies flash on their own schedule, and a summer field looks like static. In a handful of places, thousands

A waterfall you can stand behind is a different experience from one you photograph across a valley. The sound changes,

Most people alive today have never seen the Milky Way. Light pollution has erased it from the sky over the