PHOTO: Library of Congress

Known as the Exposition Girl for inspiring 1,500 sculptures at San Francisco's 1915 Panama-Pacific International Exposition (PPIE), Audrey Munson was perhaps the world's first supermodel. After posing for premier artists such as Alexander Calder – shown here working on a figure of Munson for the PPIE – Munson eventually faded from public view. More than a century later, though, her likeness still graces buildings across the country, from the State Capitol in Wisconsin and the James McMillan Memorial Fountain in Washington, DC, to the Longfellow Memorial in Cambridge, MA.