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Hammar, a leading pioneer stonemason who did much early work with locally quarried rhyolite, built this 24-by-40-foot single-story structure with thick gray rhyolite walls. The gable roof has wide, overhanging eaves on all sides supported by elaborate, diagonally braced brackets with ball pendants. Closed in 1965 and moved from its trackside location in 1970, the building served as an arts center and a senior center before its latest reincarnation as the Castle Rock Museum.