Mystic Caverns and Crystal Dome

Mystic Caverns and Crystal Dome are former show caves located between the cities of Jasper and Harrison, in the state of Arkansas, U.S., on the Arkansas Highway 7 Scenic Byway near the defunct amusement park Dogpatch USA. Sometimes called "the twin caves" because they are within of each other, the two caves maintain a year-round temperature of 58 °F, contain more formations per foot than any other caves in Arkansas, and are open for public tours year-round except during the January flooding season.