Olympic National Park’s Enchanted Valley transports hikers to another world via the East Fork Quinault River Trail.

Antarctica is hiding mountains and canyons under its ice sheet, a new map of the landscape underneath has revealed. Assembled ...

The instrument was developed by a team at the Mount Washington Observatory, and spent a year on Mount Everest before being ...

New data identifies two key risk factors for high-altitude pulmonary edema, a leading cause of death on the mountain.