Here’s how. Collins is considered “one of the greatest cave explorers of all time,” according to the National Park Service. He discovered Great Crystal Cave in 1917, which his family ran as a show ...

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 ...

Maryland's only show cave might not be the largest, but it’s packed with stunning formations at every turn. Crystal Grottoes Caverns is a hidden gem that delivers a surprising underground experience ...