Keystone Crossing is a fortress of fun, packed with enough fun features to keep kids entertained for hours. The highlight of the structure is the twin pair of 6’ tall Wave Slides. These provide great places to slide, and allow kids to challenge their friends to a race to the bottom. Keystone Crossing is a fortress of fun, packed with enough fun features to keep kids entertained for hours. The highlight of the structure is the twin pair of 6’ tall Wave Slides. These provide great places to slide, and allow kids to challenge their friends to a race to the bottom. The two slides are