The Crystal Grottoes Caverns in Bonosboro Maryland. Small and bit pricey but a lot of fun on a perfect fall day. Somehow I was not expecting Lens Flares to be a problem 30 feet underground. It’s like I was possessed by the spirit of J.J Abrams!
http://www.crystalgrottoescaverns.com/
https://en.wikipedia.org/wiki/Crystal_Grottoes

















