200 feet inside the cave there is one largest Fluorescent Mineral displays in the United States. These select few minerals naturally glow astonishingly bright colors when put under an ultraviolet light. Of course, click on the original to get a closer look.
After about 20 years of hosting those “hootenannies,” the Chamberlains grew tired of them and converted the cave into a gift shop and museum to house Mr. Chamberlain’s art and what would become one of the largest collections of phosphorescent fossilized minerals and rocks in the U.S., Roots Rated reports.