27 years ago today
Columbine High School Massacre
On April 20, 1999, two students — Eric Harris and Dylan Klebold — entered Columbine High School in Littleton, Colorado, and opened fire, killing 13 people and wounding 24 others before taking their own lives. It was, at the time, the deadliest school shooting in American history. The attack shocked the nation and fundamentally changed how schools approach security, emergency response, and mental health intervention. Investigators later revealed the pair had planned the attack for over a year. Columbine became a grim cultural reference point, sparking decades of debate over gun control, bullying, media violence, and the warning signs of radicalization.
This day, across time
- 1303EventSapienza University of Rome Founded
- 1314DiedPope Clement V
- 1586BornRose of Lima
- 1653EventCromwell Dissolves the Rump Parliament
- 1789EventGeorge Washington Passes Through Philadelphia
- 1808BornNapoleon III
- 1861EventRobert E. Lee Resigns from the U.S. Army
- 1889BornAdolf Hitler
- 1893BornJoan Miró
- 1902EventPierre and Marie Curie Refine Radium Chloride
- 1912DiedBram Stoker
- 1914EventLudlow Massacre
- 1946EventLeague of Nations Officially Dissolves
- 1972EventApollo 16 Lands on the Moon
- 1999FeaturedColumbine High School Massacre
Alive in 1999
OverlapSame years; not influence
Kofi Annanturned 61 this year
Margaret Thatcherturned 74 this year
Nelson Mandelaturned 81 this year
Ronald Reaganturned 88 this year
Steve Jobsturned 44 this year
Wangari Maathaiturned 59 this year
Step into the moment
Simulation · scenario
Dissolving the Rump
Parliament House, Palace of Westminster
Oliver Cromwell, April 20, 1653. A simulation set on this date. The figure doesn’t know how the day ends.
On This Day in History
9 EventsSapienza University of Rome Founded
Pope Boniface VIII issues a papal bull establishing the Sapienza University of Rome, one of the oldest universities in the world and the largest in Europe by enrollment.
Cromwell Dissolves the Rump Parliament
Oliver Cromwell marches into the House of Commons with a company of musketeers and forcibly dissolves England's Long Parliament — the so-called Rump — famously declaring, "You have sat too long for any good you have been doing." England was left without any representative government.
George Washington Passes Through Philadelphia
President-elect George Washington arrives at Gray's Ferry, Philadelphia, on his ceremonial journey from Mount Vernon to New York City for his inaugural as the first President of the United States.
Robert E. Lee Resigns from the U.S. Army
Colonel Robert E. Lee resigns his commission in the United States Army to take command of Virginia's forces at the outset of the Civil War. The decision cost the Union its most admired officer and proved decisive in prolonging the conflict by four years.
Pierre and Marie Curie Refine Radium Chloride
Working in their Paris laboratory, Pierre and Marie Curie successfully isolate a decigram of pure radium chloride — the culmination of years of painstaking work processing tons of uranium ore. The achievement secured Marie's second Nobel Prize and confirmed radium as a distinct element.
Ludlow Massacre
Colorado National Guard troops and company guards attack a tent colony of striking coal miners and their families at Ludlow, Colorado, killing 19 people — including 11 children and 2 women — in one of the deadliest confrontations in American labor history.
League of Nations Officially Dissolves
The League of Nations, founded after World War I to prevent future conflicts, formally dissolves, transferring its assets and responsibilities to the newly formed United Nations. It had failed in its primary mission to prevent World War II.
Apollo 16 Lands on the Moon
The Apollo 16 Lunar Module, commanded by John Young, lands in the Descartes Highlands — the first lunar landing in the highlands region. Young and Charles Duke spent nearly 71 hours on the surface, collecting 211 pounds of samples.
Columbine High School Massacre
Two students open fire at Columbine High School in Littleton, Colorado, killing 13 people and wounding 24 others before dying by suicide. The attack becomes the defining school shooting of its era and reshapes American debates over gun violence.
Born on This Day
Adolf Hitler
Führer of Nazi Germany
Born in Braunau am Inn, Austria, Hitler rose from a failed artist and WWI veteran to seize control of Germany in 1933, dismantling democracy and establishing a totalitarian regime. His ideology of racial supremacy drove the Holocaust and his military ambitions plunged the world into World War II, resulting in the deaths of an estimated 70–85 million people.
Napoleon III
Emperor of France (1852–1870)
Nephew of Napoleon Bonaparte, Louis-Napoléon Bonaparte was elected the first President of France in 1848 and later seized power in a coup to become Emperor. His reign modernized Paris under Baron Haussmann and expanded French colonial power, but ended in humiliating defeat in the Franco-Prussian War.
Joan Miró
Spanish Painter & Sculptor
One of the leading figures of Surrealism, Miró developed a distinctive visual language of bold primary colors and biomorphic shapes that influenced abstract expressionism and pop art. His works are among the most instantly recognizable in 20th-century painting.
Rose of Lima
Mystic & Saint
Born Isabel Flores de Oliva in Lima, Peru, she became the first person born in the Americas to be canonized by the Catholic Church. Known for extreme asceticism and mystical visions, she dedicated her life to serving the sick and poor of colonial Lima.
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Bram Stoker
Irish Author
The author of Dracula, published in 1897, died in London at age 64. His gothic novel created the modern vampire myth and remains one of the most influential horror works in literary history.
Pope Clement V
Pope of the Catholic Church
The French-born pope who moved the papal seat to Avignon and controversially disbanded the Knights Templar under pressure from King Philip IV of France died at Roquemaure. His papacy remains one of the most disputed in Church history.
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