The Grand Canyon, Arizona
Even blase teenagers are impressed by Mother Nature's handiwork: 18 miles wide, over one mile deep and 277 miles long. On a Tauck Bridges Red Rocks & Painted Canyons guided trip (0800 810 8020; tauck.co.uk), you stay right on the Grand Canyon rim and watch the sunrise; take a float trip on the Colorado River; fly over Rainbow Bridge National Monument; ride in Bryce Canyon with a cowboy. It's action all the way for eight days. From PS2,490 (adult), PS2,360 (child under 12).