Onyx Cave Ozarks Region Get Directions Tell us why this business is your favorite! Physical Address: U.S. 62 East Eureka Springs, AR 72632 Phone: 479-253-9321 Fax: 479-253-9321 Website: http://eurekaspringschamber.com/cat_mem.asp?chi_catid=95 GPS: N36.3791465 W93.5874391 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 1983; composed of natural onyx Add to Trip Planner