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The Obsidian Cliff Kiosk, constructed in 1931, is significant for its outstanding representation of individuality achieved by the use of a material which is a phenomenon of the immediate environs, and because it is the first wayside exhibit built in the National Park System. The ''open air museum-in-miniature'' aids the public in understanding and enjoying the natural aspects of the nearby Obsidian Cliff, a mountain of volcanic glass which extends for approximately two miles. This exhibit was one of the many significant innovations in interpretation made by Carl Russell, which are widely reflected today in how parks are interpreted and in how they are experienced by visitors.