As his last building and his only library, the Martin Luther King Jr. Memorial Library (MLKML) is the central facility of the District of Columbia Public Library System. The 400,000-square-foot steel, brick, and glass structure was completed in 1972 and is a rare example of modern architecture in Washington, D.C. Currently closed for updates, the building is scheduled to reopen in 2020.  Photo 6 of 11 in Less Is More: 10 Buildings by Ludwig Mies van der Rohe