In Belize’s Actun Tunichil Muknal cave, a sacred Maya site, plants grow in darkness, sparking concerns about how tourism affects its fragile ecosystem.

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During a visit, outdoor adventurers can tackle the Alpine Lakes Loop—a 2.7-mile path that offers marvelous views of the park’s alpine lakes and conifer forests—while the Lehman Caves system ...

Every year, dozens of them gather at sites including Mammoth Cave National Park in Kentucky, Carlsbad Caverns National Park in New Mexico, and Lehman Caves at Nevada’s Great Basin National Park. They ...

Climb or take a scenic drive up Wheeler Peak, the park’s iconic 13,000-foot mountain, for spectacular views; wander through groves of 3,000-year-old bristlecone pines; take a ranger-led tour through ...