This extraordinary discovery not only redefines our understanding of salt caves but also adds a geological wonder to Israel’s ...

Tickets for guided tours of the marble cave will go on sale at 10 a.m. on March 31. The cave features stunning stalactites ...

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

Pure quartz crystals have been spotted on Mars for the first time, as well as other gems like opal. Researchers say these crystals, as well as being evidence of past hydrothermal activity ...