History

Over the past century and a half, visitors have traveled through Yosemite on foot, by carriage, by tram and by car. Now some regions will be once again be accessible only by foot, to protect delicate regions of the park. Courtesy Yosemite National Park Research Library/KQED hide caption

Nineteen-year-old Bosnian Serb Gavrilo Princip fired the shots that killed the heir to the Austro-Hungarian empire, Archduke Franz Ferdinand, and his wife, Sophie, during a visit to Sarajevo on June 28, 1914. Depending on whom you ask, he's either a hero or a terrorist. Historical Archives Sarajevo/AP hide caption

Patrick Haggerty dresses in drag in 1959. As a teen, Haggerty learned from his father never to "sneak" around his identity. Courtesy of Patrick Haggerty hide caption

The Austro-Hungarian archduke and his wife, Sophie, board a car just prior to his assassination in Sarajevo. AP hide caption

Mississippi Freedom Democratic Party delegates and supporters stage a demonstration on the boardwalk in front of the Atlantic City Convention Center in 1964. Courtesy of George Ballis/Take Stock hide caption

Aaron Carapella, a self-taught mapmaker in Warner, Okla., has designed a map of Native American tribes showing their locations before first contact with Europeans. Hansi Lo Wang/NPR hide caption

Fannie Lou Hamer was an activist who spoke out for black rights during Freedom Summer. Courtesy of Ken Thompson/General Board of Global Ministries of The United Methodist Church hide caption

A missing persons poster displays the photographs of civil rights workers Andrew Goodman, James Earl Chaney and Michael Henry Schwerner after they disappeared in Mississippi in June 1964. It was later discovered that they were murdered by the Ku Klux Klan. Bettmann/Corbis hide caption

Huguette Clark in 1930. She had a mansion in Connecticut that was never occupied, and her New York apartments were kept up, unoccupied, for more than 20 years. AP hide caption

Arlington National Cemetery is the final resting place for more than 400,000 men and women. Most were members of the armed forces who served in active duty — but not all. Paul J. Richards/AFP/Getty Images hide caption

Freedom Summer activists sing before leaving training sessions at Western College for Women in Oxford, Ohio, for Mississippi in June 1964. Ted Polumbaum Collection/Newseum hide caption