1 Best Sight in Aspen and the Roaring Fork Valley, Colorado

Glenwood Canyon

It took the Colorado River a half-billion years to carve the deep granite, limestone, and quartzite gullies—buff-tint walls brilliantly streaked with lavender, rose, and ivory—of this 16-mile-long canyon. Then, man stepped in, seeking a more direct route west. In 1992, the costly work on I–70 through the canyon east of Glenwood Springs was completed, with much of the expense attributable to the effort to preserve the landscape. When contractors blasted cliff faces, for example, they stained the exposed rock to simulate nature's weathering. Bike the canyon on a paved, riverside recreation path, hike to the steep (but worth it) trail to Hanging Lake or try to focus on fishing or rafting the river with views of the canyon walls towering above.

Glenwood Springs, Colorado, USA