We took a trip out to Wonderworld Park to see the earthquake formed cave. At one point during the tour, they turned out the lights to show how completely dark and black it was. I couldn't even see my hand move in front of my face. The kids didn't like that very much. We also went into a gravity house where it was incredibly difficult to walk because of the slope in the floor and the lines painted on the walls. They rolled balls down a ramp and water too, but it looked like they were going up because of the illusion created in the house.