The 100th birthday of the National Park Service seems a fitting day for this video even if longer than my usual video.

A photographic, captioned hike along the John Muir trail - and of course, John Muir is one of those people the Park System would not exist without.

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Clips from Devil’s Postpile National Monument - classic example of columnar jointing in California. Take note of the shapes of the columns as this traveler walks atop them.