suspended from bark-covered walls. It is now called the Orchid Room and has a collection of approximately 25,000 natural species. The Display House is used for seasonal flower and plant exhibits. A docent program run by the Chicago Park District and Lincoln Park Conservancy provides free tours of the Conservatory and its outdoor gardens from 1-4 p.m. on Fridays, Saturdays, and Sundays and from 9 to Noon on Saturdays. Lily Pool Located on Fullerton Parkway between Stockton and Cannon Drives, the Alfred Caldwell Lily Pool is an historic example of Prairie School landscape architecture. The Lily Pool was listed on the National Register of Historic Places and as a National Historic Landmark on February 17, 2006. The Lily Pool had originally been built to cultivate tropical water lilies in 1889. In the 1930s, the Works Progress Administration hired landscape architect Alfred Caldwell to redesign the pool in the Prairie School style. From 1998 to 2002, the Lily Pool underwent an extensive restoration by the Lincoln Park Conservancy and the Chicago Park District, which earned the site its historic designations, and renamed the site after Alfred Caldwell. The Lily Pool is open seasonally from mid-April to mid-November from 7:30 a.m. to the earlier of dusk or 7:30 p.m. every day. A docent program run by the Chicago Park District and Lincoln Park Conservancy offers free tours from 1-4 p.m. on Fridays, Saturdays, and Sundays, and from 9 - Noon on Saturdays during operating season. Nature Museum First established in 1857, the Chicago Academy of Sciences opened its most recent facility, the Nature Museum, in 1999. The Academy's previous museum building, the Matthew Laflin Memorial Building, was the Park District's first museum in the parks. The museum's exhibits include displays about the ecological history of the Illinois region, a live butterfly house, and a green home demonstration. The butterfly house features over 200 species of exotic butterflies. The museum also offers educational programs for adults and children. History Museum Located at Clark Street and North Avenue, the Chicago History Museum (formerly the Chicago Historical Society) is dedicated to Chicago's human history. Perhaps among its most well-known possessions are Abraham Lincoln's deathbed and several furniture pieces from the room where he died in the Petersen House in Washington, D.C., as well as clothing he and wife Mary Todd Lincoln wore the evening of his assassination. The museum also houses Chicago's most important collection