Explore Mesa Verde National Park, home to more than 4,000 archaeological sites, enjoy a river float trip on the Colorado River from Moab and hike past red-rock canyons, sandstone spires, jagged cliffs, high mesas in Canyonlands and Arches National Parks.

Yellowstone, one of nature's true masterpieces, boasts incredible geothermal sites, an amazing array of wildlife, and diverse landscapes with vibrant flora.

An explorer's dream, Alaska is America's last great frontier - and an absolute pleasure to discover on foot, in sea kayaks, and by boat.

Towering peaks capped with snow, emerald lakes that mirror subalpine forest, the crack of shifting glaciers, and diverse wildlife along rugged trails - welcome to the majestic Canadian Rockies.

Setting off from the Lower Sonoran desert, on trails marked by saguaro cacti and the yellow-flowering Palo Verde tree, you ascend to the Colorado Plateau for views of the San Francisco Peaks and, perhaps, rare California condors.