Here’s a look at some interesting events that took place on this day in history:

1815 – Napoleon Bonaparte escapes from exile on the island of Elba (More info)

1919 – President Woodrow Wilson signs an act establishing most of the Grand Canyon as a US National Park (More info)

1935 – RADAR, an acronym for Radio Detection and Ranging, is first demonstrated by Robert Watson-Watt (More info)

1972 – A collapsed dam floods a valley in West Virginia, leaving 118 people dead and thousands homeless (More info)

1993 – A bomb explodes in the parking garage beneath the World Trade Center in New York City, killing six people and injuring over 1,000 more (More info)