to the current complex in Lincoln Park. The oldest part of the museum, designed by Graham, Anderson, Probst & White, was built in 1932 by the WPA, with the aim of creating expanded public exhibition space. The 1932 Federal-style structure has been expanded twice. The first addition, clad in limestone, opened in 1972 and was designed by Alfred Shaw and Associates. The second addition, designed by Holabird and Root, was done in 1988 and included refacing the earlier expansion in red brick to give a unified look to all three portions of the building. Both expansions occurred on the west side of the 1932 structure, leaving intact its original porticoed entrance facing Lincoln Park. The main entrance and reception hall, however, was moved to the new western addition facing Clark street. The 1988 extension, in addition to expanded exhibition galleries, also contains the museum's store and public cafe. Activities The museum explores both Chicago and American history. Exhibitions draw primarily on the museum's own collection, which numbers approximately 22 million holdings. Chicago: Crossroads of America is a 16,000-square-foot space that explores the city's development and its relationship to and influence on American history. Nearly 600 objects document the people and events of the past 200 years. Facing Freedom focuses on eight American conflicts over freedom from the 1850s to the 1970s. The Abraham Lincoln alcoves highlight the sixteenth president's election, his leadership during the Civil War, and his assassination. The adjoining Portrait Gallery features an installation on Chicago during the time of Lincoln. The Sensing Chicago exhibition invites children to use their senses to discover the past. The lobby displays various museum treasures. The newly restored dioramas are housed in the Tawani Foundation Diorama Hall. The Chicago dioramas feature Chicago's rise from a desolate frontier outpost to the bustling city that hosted the World's Columbian Exposition of 1893. The Chicago Room, which overlooks the plaza in Lincoln Park behind the museum building, displays a collection of stained glass. Temporary exhibitions feature objects and artifacts from the collection, covering everything from Chicago art to the history of lesbian, gay, bisexual, and transgender Chicagoans to the city's fashion history. On October 14, 2013, the Chicago History Museum announced a project asking the public to furnish ideas for a future exhibition and reducing the most-often-submitted ideas to one assignment through a series of public votes. According to the American Alliance of Museums, this