Crystal Cave, the ancient marble cavern at the end of a steep half-mile hike in Sequoia National Park, is slated to reopen to ...

While hundreds of parks are free to enter, others use timed entry and other reservation methods to control crowds — but that also means you may need to secure your spot well in advance.

There’s no shortage of public lands to explore in America, from craggy canyons and remote islands to ancient forests and ...