Preparations are under way to celebrate Jewel Cave's first century as a national monument, according to officials at the facility.

Jewel Cave National Monument will be open 8 a.m. to 5 p.m. daily starting Sunday, May 30. Limited walk-in/walk-out tours of the cave will resume that day while repair work continues on the elevator.

Jewel Cave National Monument Explorers have mapped more than 192 miles of twisting underground passageways in this cave system and continue to explore more of it each year with no end in sight, making ...

Whether you’re into stalactite symphonies, prehistoric shelters, or just love your trails dark and damp, these 10 U.S. underground wonders ( cited by fans on TripAdvisor and other sources) have you ...