Marble caves, large calcite formations, and huge underground rooms shape this rare adventure in geology. Guided cave tours take place on the hour in late spring and fall, and every half hour June through August. The 90-minute half-mile tour is moderately strenuous with low passageways, twisting turns, and more than 500 stairs; children must be at least 42 inches tall to go on the tour. Cave tours aren't given in winter. Above ground, the surrounding valley holds an old-growth forest with some of the state's largest trees. Park officials say that GPS coordinates for the caves often direct drivers onto a mostly unpaved forest service road meant for four-wheel-drive vehicles. Instead, follow Highway 46 off U.S. 199 at Cave Junction, which is also narrow and twisty in parts; RVs or trailers over 32 feet not advised.
19000 Caves Hwy. (Hwy. 46), 20 miles east of U.S. 199, Cave Junction, Oregon, 97523, United States