Rosa Parks, shown in Seattle in 1956, saved postcards from Martin Luther King Jr. and notes about carpooling during the Montgomery Bus Boycott. They're now being cataloged by the Library of Congress. Gil Baker/Courtesy of the Library of Congress, Rosa & Raymond Parks Institute for Self Development hide caption

itoggle caption Gil Baker/Courtesy of the Library of Congress, Rosa & Raymond Parks Institute for Self Development

Schoolchildren tour the bus that civil rights icon Rosa Parks made famous when she refused to give up her seat. Bill Pugliano/Getty Images hide caption

itoggle caption Bill Pugliano/Getty Images

President Obama reached out to touch the statue of civil rights icon Rosa Parks during Wednesday's dedication ceremony in the U.S. Capitol. Senate Minority Leader Mitch McConnell, R-Ky., was behind the president. Jason Reed/Reuters /Landov hide caption

itoggle caption Jason Reed/Reuters /Landov