North Wall Rock Climbing - Indoor multi-level bouldering cave, with gear shop and courses offered. Chicago, USA. - http://www.climbnorthwall.com/
Upper Limits - Bloomington. 20,000 square feet of climbing area including 110 foot vertical outdoor routes and a multi-level bouldering cave. - http://www.upperlimits.com/
Climb On - Homewood. 33 feet high. Approximately 40% of the gym is overhanging and all of it is leadable. Youth Climbing Team. Parties. Gear shop. - http://www.climbon.net/