Napoleon Bonaparte escaped from exile on the island of Elba.
A 312-ft long pneumatic subway was opened in New York City; funding for a larger version never materialized.
Leaders of the Boxer Uprising in China, Chi-hsui and Hsu Cheng-yu, were beheaded.
Grand Canyon National Park was established.
RADAR (Radio Detection and Ranging) was first demonstrated by Robert Watson-Watt.
A bomb exploded at the World Trade Center in New York. The blast killed six people and injured more than 1,000.