The Battle of Gettysburg was the pivotal moment of the Civil War and the bloodiest hour in American history. These photos tell its story.

An outspoken socialite from Arkansas, Martha Mitchell tried to pull back the curtain on Watergate, but she was gaslit, dismissed, and discredited at every turn.

Authorities are still baffled as to what happened to Rebecca Coriam, the young British cruise ship employee who vanished from the Disney Wonder on March 22, 2011.

On May 25, 1979, six-year-old Etan Patz disappeared in the SoHo neighborhood of Manhattan in New York City. He was never seen alive again.

From the "Giggling Granny" to the "Toy Box Killer," these brutal murderers number among history's most disturbingly prolific serial killers.

The chilling story of the Sodder children, who vanished after their West Virginia home went up in flames in 1945, leaves more questions than answers.

Whether gorgeous or terrifying, these Native American masks reveal a group of cultures on the verge of disappearing forever.

These rarely-seen pictures of President John F. Kennedy's assassination, autopsy, and funeral reveal the full story of the shooting that shook the nation in Dallas, Texas on November 22, 1963.

These heart-rending, life-affirming Anne Frank quotes and photos can teach us all about courage and reveal that hope is always possible.

From royal courts of Renaissance Europe to rock stars of the 1960s, these infamous cases of incest will make your skin crawl.

In just one year between 1979 and 1980, "Freeway Strangler" William George Bonin murdered at least 21 victims, though some suspect he killed over a dozen more.