Fodor's Expert Review Devils Postpile National Monument

Volcanic and glacial forces sculpted this formation of smooth, vertical basalt columns. For a bird's-eye view, take the short, steep trail to the top of a 60-foot cliff. To see the monument's second scenic wonder, Rainbow Falls, hike 2 miles past Devils Postpile. A branch of the San Joaquin River plunges more than 100 feet over a lava ledge here. When the water hits the pool below, sunlight turns the resulting mist into a spray of color. From mid-June to early September, day-use visitors must ride the shuttle bus from the Mammoth Mountain Ski Area to the monument.