Zip line participants walk back to base after completing the MegaZip zip line run at the US National Whitewater Center (USNWC). The USNWC's zip-lines are part of the facilities high-adventure offerings. The popular outdoor adventure activity lets outdoor enthusiasts be secured into a harness then propelled by gravity along an inclined steel cable. Charlotte, North Carolina's US National Whitewater Center offers multiple zip line courses, which vary in height and distance traveled, as well as one of the largest outdoor climbing facilities in the world. The USNWC is a non-profit outdoor recreation facility open to the public for whitewater rafting, kayaking, canoeing, rappelling, zip lining, mountain biking, hiking, climbing and more. The center opened to the public in 2006.