As such, they are believed to be the purest form of selenite crystal in the world. The Cave of the Crystals ... the tubing to keep the researchers cool. But even with those suits, the team ...

U.S. News Insider Tip: Café Olé, just outside the Crystal & Fantasy Caves, has one of the best fish sandwiches on the island. A sun hat is essential because you'll sit in the garden while they ...