Earth Treks Climbing Center offers the recipient of this prize 2 climbing passes, which are redeemable at any of our Earth Trek Climbing Center locations. Each pass may be used for either two Open Climbs or two Day Passes. Earth Treks' Climbing Centers are state-of-the-art indoor climbing gyms located in Columbia, Timonium and Rockville, MD. We pride ourselves on offering the best rock climbing in the greater Washington DC, Northern Virginia and Maryland region. Each climbing gym is among the largest in the country, with plenty of climbing for every ability level. We make It easy to learn to climb. Each year we teach over 20,000 people to climb. Climbers under the age of 18 must have a parent or court appointed guardian sign a waiver.