Construction began on the Hoover Dam in Nevada.
It was originally called the Boulder Dam.
Source
Spanish conquistadors defeated a large Aztec army at the Battle of Otumba.
Sir Isaac Newton gained a master's degree from Trinity College, Cambridge, England.
In just 57 seconds, illusionist Harry Houdini successfully unchained himself while underwater.
Dutch artist Wilfred Stijger broke the world record for the tallest sandcastle.
'Harry Potter and the Deathly Hallows – Part 2' premiered in London.
