Roadside America

Crystal Grottoes Caverns in Boonsboro, Maryland

Tour Maryland’s only show cave in this delightful throwback to America’s roadside attractions.

This small demonstration cave is Maryland’s largest cavern open to the public. It contains more formations per square foot than any other explored cave, and it’s among the most naturally preserved caverns in the world, with a constant temperature of 54 degrees.

Crystal Grottoes formed in Tomstown Dolomite over millions of years. The cellar is mostly horizontal and the corridors are generally high and narrow. Its floors are brown and red clay; sediment covers several passages within one to two feet of the ceiling. 

The 30-35 minute tour covers 900 feet of its passages, or about one-third of the total cave space. There are no streams, although steadily dripping water collects into a small “lake” or tub.

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