The result was the Stone Gate, three arches of Lemont limestone roofed in copper and displaying over the central arch the carved bust - Root's touch, no doubt - of John Sherman's favorite bull, Sherman. The gate became a landmark that endured into the twenty-first century, long after the last hog crossed to eternity over the great wooden ramp called the Bridge of Sighs. Erik Larson

From about 1879 to 1971, this triple-arched, rough-faced limestone gate was the main entrance to the Chicago Union Stockyards. The Stockyards, founded in 1865 to consolidate the many scattered stockyards in Chicago into an efficient unit, symbolized Chicago's role as a major meat-packing center. - NPS