Unity Temple (1905, Oak Park, Illinois). This structure was one of the first public buildings to be made with affordable, poured-in-place reinforced concrete. Photo 9 of 10 in Iconic Frank Lloyd Wright Buildings by Allie Weiss

Iconic Frank Lloyd Wright Buildings

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Unity Temple (1905, Oak Park, Illinois). This structure was one of the first public buildings to be made with affordable, poured-in-place reinforced concrete.