1921

The Women’s Olympiad, the first international women’s sporting event, began in Monte Carlo, Monaco.

1989

Supertanker Exxon Valdez ran aground on a reef in Alaska and began leaking about 11 million gallons of crude oil.

1999

NATO launched airstrikes against Yugoslavia, marking the first time that it attacked a sovereign country.

2015

Germanwings Flight 9525 crashed into the French Alps, killing all 150 people on board.