On this day in 1961, the Twenty-third Amendment to the United States Constitution was ratified, allowing residents of Washington DC to vote in presidential elections.
On this day in 1973, the last United States combat soldiers left South Vietnam.
On this day in 1974, NASA's Mariner 10 became the first space probe to fly by Mercury.
On this day in 1974, local farmers in Xi'an, Shaanxi province, China, discovered the Terracotta Army that was buried with Qin Shi Huang, the first Emperor of China, in the 3rd century BCE.
On this day in 1999, the Dow Jones Industrial Average closed above the 10,000 mark for the first time, during the height of the internet boom.
And on this day in 2004, the Republic of Ireland became the first country in the world to ban smoking in all work places, including bars and restaurants.