Onyx Cave WEBSITE ADD TO Trip Planner Self-guided tour through the chambers with names like the Witches Fireplace and Friendly Dragon. Electronic messages point out the cave's features; discovered in 1893; composed of natural onyx. Get Directions Gas Calculator Details Website: www.OnyxCaveEurekaSprings.com Phone: 479-253-9321 Fax: 479-253-9321 Address: U.S. 62 EastEureka Springs, AR 72632 Follow: Things to Do In Eureka Springs EXPLORE Business Closed? Yes No Incorrect Information? Yes No What needs to be changed?