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From its beginning in 1974 as the Cavalry Museum, the 44,000-square-foot El Paso Museum of History has charted the history of the upper Rio Grande border region. Offset rectangular masses, sheathed in rock-faced concrete masonry units, windowless on the W. Missouri Avenue side, are fragmented into curved and angled shapes on the south side, facing what is left of Cleveland Square Park. Horizontal corrugated metal panels clad the entrance, and four vertical window bays are the only sources of daylight into the controlled exhibit areas.