The town of Naica, Mexico, sits approximately 1,000 feet (300 meters) above the hidden crystal cave below. The cave was unknown until 2000, when miners inadvertently discovered it.

Today, the Naica Mine is no longer active, and water has again filled the crystal cavern. Boston and her colleagues took two trips to the mine, in 2008 and 2009, before the cave was flooded.

In 1910 miners discovered another spectacular cavern beneath Naica. Its walls studded with crystal "daggers," the Cave of Swords is closer to the surface, at a depth of nearly 400 feet (120 meters).

In the far reaches of Pettyjohn Cave, a huge crystal was uncovered, offering a breathtaking glimpse into the cave’s hidden ...

The stalactites and stalagmites of Sequoia National Park’s Crystal Cave, a sprawling subterranean wonder that’s been closed for four years, will be accessible again this summer. But to get in ...

While exploring the depths of Pettyjohns Cave, we made an incredible discovery - a hidden chamber filled with huge, glistening crystals. In this video, we take you along as we crawl, climb, and ...

Crystal Cave has reopened after four years of repairs. In 2021, lightning ignited the KNP Complex fires that ended up burning 88,000 acres, and killing thousands of sequoias.

The stalactites and stalagmites of Sequoia National Park’s Crystal Cave, a sprawling subterranean wonder that’s been closed for four years, will be accessible again this summer. But to get in ...

Crystal Cave, located in Sequoia National Park, reopens to the public on May 23 after a four-year closure due to fire and weather damage. Visitors can purchase tickets for guided tours, with ...

DUBUQUE, Iowa — This journey to eastern Iowa and the Mississippi Masterpiece takes us down below. The Crystal Lake Cave in Dubuque was first discovered in 1868.

Today, the Naica Mine is no longer active, and water has again filled the crystal cavern. Boston and her colleagues took two trips to the mine, in 2008 and 2009, before the cave was flooded.