The Smithsonian’s National Portrait Gallery is commemorating the 75th anniversary of Amelia Earhart’s disappearance on an around-the-world flight. She was called “Lady Lindy” after pioneering aviator Charles Lindbergh, and the mystery surrounding her loss continues to fascinate Americans. We visited the exhibit “One Life: Amelia Earhart,” which chronicles her much-photographed life and exploits. (Amelia Earhart image courtesy of Seligman Family Foundation.)