Dyanna Taylor, director of Dorothea Lange: Grab a Hunk of Lightning, visits the Library of Congress to view its collection of her grandmother's photography.

Migrant Mother is one of the most recognized and arresting images in the world, a portrait that came to represent America's Great Depression. Yet few know the story, struggles and profound body of work of the woman who created the portrait: Dorothea Lange. Watch a preview of Dorothea Lange: Grab a Hunk of Lightning., directed by Lange's granddaughter Dyanna Taylor.

Watch ballerina "Tanny" (Tanaquil Le Clercq) in action in these five fantastic gifs showing her technique and flair. All footage is from performances she gave with the New York City Ballet.

On June 19, join American Masters and the filmmaker of Tanaquil Le Clercq: Afternoon of a Faun, Nancy Buirski, for an extended online preview of the film before the national television premiere.

The disease polio was prevalent in the 20th century until a vaccine was developed in the 1950s. Learn more about iron lungs, polio and the famous people who survived it, including ballerina Tanaquil Le Clercq, President Franklin D. Roosevelt and more.

"She had an astonishing sense of humor about her physical condition," says Le Clercq's friend in this film outtake. His anecdote illustrates how people with a visible disability might not always be shown respect, and how humor is always a good comeback.

See film excerpts of Tanaquil Le Clercq dancing with the New York City Ballet and learn about the repertoire she performed in during her career as a soloist in Balanchine's ballet company.