Columbine High School was the site of one of the deadliest mass shootings in modern United States history. The school is located at 6201 South Pierce Street, one mile west of the Littleton city limits and one-half mile south of the Denver city/county line. The shootings occurred on April 20, 1999, when two senior students Eric Harris and Dylan Klebold killed twelve students and a teacher, and wounded 23 others, before they both committed suicide.
The massacre made headlines both nationally and internationally, making Columbine a household name, and causing a moral panic in American high schools. It was the deadliest high school shooting in U.S. history until the Stoneman Douglas High School shooting on February 14, 2018.
The school went through a major renovation in 1995, just four years before the massacre, adding a new library and cafeteria. After the shootings, Columbine completely demolished its library, located above the cafeteria, since it was the site where the majority of the deaths occurred. The site was then turned into a memorial ceiling and atrium; a new, larger library was built on the hill where the shooting began and dedicated to the memory of the victims.