On this day in 1937, the Golden Gate Bridge in San Francisco, California, was officially opened by President Franklin D. Roosevelt in Washington, D.C., who pushed a button signaling the start of vehicle traffic over the span.
On this day in 1952, the women of Greece were granted the right to vote.
On this day in 1999, in Milan, Italy, after 22 years of restoration work, Leonardo da Vinci's masterpiece The Last Supper was put back on display.
And on this day in 2002, the Mars Odyssey found signs of large ice deposits on the planet Mars.