Luminarias light Spruce Tree House, an ancient dwelling of the Anasazi people and the third largest cliff dwelling in Colorado's Mesa Verde National Park. From Cortez, take US 160 east for eight ...

A 20-foot-high wall of mud, ash, and melted snow roared down the mountain, snapping tree trunks ... dome—can be found in Lassen Volcanic National Park, where they literally bubble and steam.