Inside Pennsylvania Hall in 1838, an abolitionist meeting was disrupted when members of an anti-abolitionist mob threw rocks through the windows. The following night, the protestors set fire to the building -- completely destroying Philadelphia's monument to free speech.
The international manhunt to catch the killer of Martin Luther King.
The trial of nine falsely accused African American teens in Alabama would draw North and South into their sharpest conflict since the Civil War.
Robert Noyce's invention of the microchip launched the world into the Information Age.
President Richard Nixon and Henry Kissinger initiated a secret diplomatic breakthrough with Mao Tse-tung that shocked and changed the world.
From a small-town Texas murder emerged a landmark civil rights case that successfully challenged Jim Crow-style discrimination against Mexican Americans.
Robert Moses fueled some of the most ambitious -- and controversial -- public works projects ever conceived.
An African American civil rights leader, Ida B. Wells was born into slavery before becoming a journalist in Memphis.
The unusual life of David Vetter, who lived permanently inside a germ-free environment due to severe combined immunodeficiency.