In 2006, the Art Institute began building its new "The Modern Wing". The new wing is on the southwest corner of Columbus and Monroe. Pritzker Prize winning architect Renzo Piano designed the new wing. It opened to the public on May 16, 2009. The building makes the Art Institute the second largest art museum in the United States. The building houses the museum’s world-renowned collections of 20th- and 21st-century art, specifically modern European painting and sculpture, contemporary art, architecture and design, and photography.