Kayaking through cavern systems is one of the most unique adventures anyone can experience. The thrill of exploration ...

SEQUOIA NATIONAL PARK (KFSN) -- After a four-year closure, Crystal Cave in Sequoia National Park is finally opening to visitors again. Tickets for guided tours of the underground marble cave go on ...

AND WE DO MEAN "SET YOUR ALARM": Tickets will move quickly, given the cave's perennial popularity and its recent closure. Your admission, once purchased, will give you the opportunity to join a 50 ...