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Main Menu > Yosemite National Park > Also Nearby Devils Postpile National Monument Mammoth Lakes, California This Excursion Comes From ... National Geographic's Guide to the Lewis and Clark Trail For more National Geographic travel guides—from Europe to Antarctica and everywhere in between—visit National Geographic Books >> Surrounded by the Inyo National Forest, this monument boasts a spectacular formation of basalt columns 60 feet [18.3 meters] high, which were born of the fire of volcanic eruptions and carved by the ice of overriding glaciers. At Rainbow Falls, water plunges 101 feet [30.8 meters] over a rhyodacite cliff. 798 acres [322.9 hectares]. Facilities include 21 campsites (open July-Oct.), hiking, fishing, shuttle bus. Open July-Oct. Off Calif. Hwy. 203 about 40 miles [64.4 kilometers] from Yosemite NP. June-Oct. +1 619 934 2289; Nov.-May +1 619 872 4881. More Recommendations for Yosemite National Park