Standing on the edge of the Grand Canyon, searching the shadowy depths for the silver ribbon of the Colorado River thousands of feet below, we are overcome by wonder at our own tiny instant in geological history. The canyon's sedimentary layers, stacked more than a mile thick, are a calendar for the millennia, formed by the erosive power of water and wind over eons. While this region is known as Red Rock Country, the canyon walls glow gold, rose, rust and violet, ever-changing as the high desert light works its magic. No less moving are neighboring Bryce and Zion, whose pink pinnacles and soaring sandstone ramparts round out this trio of famed Southwest national parks. Explore highlights and hidden corners of all three on this classic Western nature adventure, guided by natural history experts.