This weekend, Kris' mom and aunt were visiting and we drove up to the Grand Canyon. They'd never seen it, and neither had our kids.
There was 4 inches of snow on the rim and a lot of fog, but they still got a sense of the splendor of the world's biggest ditch. B was nervous about falling in, and totally in awe when Kris and I explained that we have backpacked down to the bottom and along the Colorado River for several days.
Miles? He appreciated it in his own way...by driving his Matchbox cars along the rim at Grandview.