Devil's Postpile NM, CA
A close-up, an intimate view, if you want, of the impressive basaltic columns that make up the Devils Postpile National Monument in the Sierra Nevada of California. The polygonal structure, which is said to be some odd 100,000 years old, formed when a huge pool of lava cooled evenly and slowly. Similar structures can be found around the globe in areas with high volcanic activity in the past.
