For anyone who's seen the original Richard Donner "Superman" movie ... are believed to be the purest form of selenite crystal in the world. The Cave of the Crystals, or Cueva de los cristales ...

But originally, it was just a mountain cave where Clark stashed his ... to the Fortress of Solitude in Superman. The teaser trailer shows crystal spires coming up out of the ground, a similar ...

Crystal Cave, the ancient marble cavern at the end of a steep half-mile hike in Sequoia National Park, is slated to reopen to visitors this summer after four years of closure.The cave features a ...