This Day In History: 04/20/1999 - Columbine Massacre

On this day in 1999, two teenage gunmen kill 13 people in a shooting spree at Columbine High School in Littleton, Colorado, south of Denver.

1:00m watch

Related Videos

The Activists Who Removed Homosexuality from the Diagnostic and Statistical Manual of Mental Disorders

The DSM once labeled homosexuality a mental disorder. In the 1960s, LGBTQ+ activists Barbara Gittings and Frank Kameny pushed to change that, helping spur its removal from the DSM in 1973.

'Between a Rock and a Hard Place' May Have Originated in the Odyssey

The common phrase may trace back to a perilous moment in Greek myth.

America's Terrifying Battle to Control the Seas

The story of how America’s battle to control the seas against the terrifying German U-boats in the Atlantic and Japan’s fearsome Navy in the Pacific ultimately turns the tide of the war. See more in this clip from Season 1, Episode 5, "The War at Sea."

Preview: Guadalcanal

See what’s to come in the new episode of World War II with Tom Hanks, premiering Mon., June 8 at 8/7c and streaming the next day.