"Grand" doesn't begin to do this canyon justice. Measuring approximately 277 river miles in length, up to 18 miles in width and a mile deep, this massive chasm in northern Arizona is truly a natural wonder. For six million years, the Grand Canyon has expanded with the help of the mighty Colorado River, and for centuries, people from all over the globe have traveled to gaze out over its red and orange grandeur. Managed by the National Park Service and officially designated as a UNESCO World Heritage site, the Grand Canyon leaves its approximately 6 million visitors per year awestruck.
One of California's most formidable natural landscapes, Yosemite National Park features nearly 1,200 square miles of sheer awe: towering waterfalls, millennia-old Sequoia trees, striking, daunting cliff faces and some of the most unique rock formations in the United States. But despite its enormous size, most of the tourist activity takes place within the 8-square-mile area of Yosemite Valley. Here you'll find the park's most famous landmarks – Half Dome and El Capitan – as well as excellent hiking trails through the natural monuments. Even inexperienced hikers can enjoy Yosemite: Guided tours and climbing lessons are available from local adventure outfitters. Just don't expect to experience it by yourself. Like so many other American tourist destinations, crowds are the biggest obstacles to an enjoyable Yosemite vacation – approximately 4 million people visit each year. But if you go at the right time (and start your day a little earlier than usual), Mother Nature's wonders will reveal themselves to you in a miraculous and serene way.
With dramatic peaks and pristine lakes, Yellowstone National Park is an outdoor enthusiast's paradise. Multicolored pools swirl around hot springs; verdant forests weave past expansive meadows; and volatile geysers launch streams of steaming water toward the sky. With so much unspoiled natural beauty, it's no wonder why everyone suspected John Colter (a scout for explorers Lewis and Clark) was embellishing when he first described Yellowstone's geothermal curiosities in 1807. Nowadays, there's no doubt that the park is indeed extraordinary. While you traverse its 3,000-plus square miles of mountains, canyons, geysers and waterfalls, be prepared to share the trails with permanent residents like buffalo, elk and sometimes even grizzlies.
