The Grand Canyon is one of the most gorgeous and fascinating sights in the world. Get the full effect of its vastness if you're brave enough to step onto the Skywalk: a glass platform suspended 70 feet out over the canyon. This experience will stick in your kids memories, and it will likely be the story they tell when they return to school. This year only, see the "Amazing Kolb Brothers" exhibit, a Victorian home where the Kolb family lived and captured photographs of their adventures in the canyon.