Paul Wilcox descends into Devil’s Canopy Cave on Prince of Wales Island. An unlikely discovery in a cave on Prince of Wales Island could help scientists understand Earth’s climate history. A small ...

Paul Wilcox explores caves in a temperate rainforest area on Prince of Wales Island in southeast Alaska for their paleoclimatic significance. Paul Wilcox, a geologist at the University of Innsbruck, ...

I hike 2 miles through deep snow to find the famous Castner Glacier ice cave. A guide tells me it's collapsing and moving down the mountain, and won't be here much longer. Inside, I crouch low under ...

From Northern Lights in Denali to whale watching in Maui, these U.S. national parks offer rare winter experiences without peak-season crowds.