Super Bowl or Stanley Cup Finals, not the entire playoffs), the lions are frequently dressed in that team's uniform. Evergreen wreaths are placed around their necks during the Christmas season. The east entrance of the museum is marked by the stone arch entrance to the old Chicago Stock Exchange. Designed by Louis Sullivan in 1894, the Exchange was torn down in 1972, but salvaged portions of the original trading room were brought to the Art Institute and reconstructed. The Art Institute building has the unusual property of straddling open-air railroad tracks. Two stories of gallery space connect the east and west buildings while the Metra Electric and South Shore lines operate below. The lower level of gallery space was formerly the windowless Gunsaulus hall, but is now home to the Alsdorf Galleries showcasing Indian, Southeast Asian and Himalayan Art. During renovation, windows facing north toward Millennium Park were added. The gallery space was designed by Renzo Piano in conjunction with his design of the Modern Wing and features the same window screening used there to protect the art from direct sunlight. The upper level formerly held the modern European galleries, but was renovated in 2008 and now features the Impressionist and Post-Impressionist galleries. Libraries Located on the ground floor of the museum is the Ryerson & Burnham Libraries. The Libraries' collections cover all periods of art, but is most known for its extensive collection of 18th to 20th century architecture. It serves the museum staff, college and university students, and is also open to the general public. The Friends of the Libraries, a support group for the Libraries, offers events and special tours for its members. Modern Wing On May 16, 2009, the Art Institute opened the Modern Wing, the largest expansion in the museum's history. The addition, designed by Renzo Piano, makes the Art Institute the second-largest museum in the US. The architect of record in the City of Chicago for this building was Interactive Design. The Modern Wing is home to the museum's collection of early 20th-century European art, including Pablo Picasso's The Old Guitarist, Henri Matisse's Bathers by a River, and René Magritte's Time Transfixed. The Lindy and Edwin Bergman Collection of Surrealist art includes the largest public display of Joseph Cornell's works (37 boxes and collages). The Wing also houses contemporary art from after 1960; new photography, video media, architecture and design galleries including original renderings