Utilizing state-of-the-art indoor climbing gyms, Earth Treks Climbing Centers offers an assortment of rock climbing activities. If you're 18 or older, you can come right into this 17,000-square-foot Columbia facility and learn the basics of climbing. Started more than a decade ago by Chris Warner, Earth Treks Climbing Center offers numerous classes, training expeditions and impromptu journeys up a huge wall for families, adults and children. Beginners can attend the Open Climb sessions on Saturdays and Sundays.