The museum originally opened at the Academy of Natural Sciences on October 2, 1976, in a space, and moved to another location on nearby Cherry Street two years later. In 1983, the museum moved to 21st Street near the Franklin Institute. On February 14, 2005, the museum received an 80-year lease for Memorial Hall (in Fairmount Park), the last major building left from the 1876 Centennial Exposition. This came after plans to relocate the museum to a location at Penn's Landing fell through. Renovations at Memorial Hall began on December 15, 2005, and the museum closed its 21st Street location on September 1, 2008. On October 18, 2008, the museum opened at its current location with a larger facility and more exhibits.