1. On this day in 1913: Buenos Aires Metro, the first underground railway system in the Southern Hemisphere and in Latin America, began its operation. The Buenos Aires Underground, locally known as Subte, was a mass transit subway system that served the metropolitan area of Buenos Aires, Argentina.
2. On this day in 1919: The first issue of Diário de Noite was published from Goa.
3. On this day in 1935: Austria had world's 1st Day of Postage Stamp
4. On this day in 1959: 1st color photograph of Earth was taken from outer space.
5. On this day in 1963: Nagaland became the 16th state of India.
6. On this day in 1964: Malawi, Malta and Zambia joined the United Nations.
7. On this day in 1965: India's Border Security Force was established.
8. On this day in 1973: Jack Nicklaus became 1st golfer to earn $2M in a year.
9. On this day in 1973: Papua New Guinea gained self-governance from Australia.
10. On this day in 1976: Angola joined the United Nations.
11. On this day in 1988: First World Aids Day was held. Dr. Jonathan Mann, Director of the Global Program on AIDS (later known as UNAIDS) had approved a concept put forward by James W. Bunn and Thomas Netter in 1987.
12. On this day in 1990: British and French workers dig the Channel Tunnel between their countries, finally met after knocking out a passage in a service tunnel large enough to walk through and shake hands.
13. On this day in 1991: Ukrainians voted overwhelmingly for independence from the Soviet Union.
14. On this day in 1999: Ireland joined NATO's Partnership for Peace program.
15. On this day in 2005: South Africa was the 5th country to recognize same-sex marriages
16. On this day in 2012: In ceremonies held at Naval Station Norfolk in Virginia, the world's first nuclear-powered aircraft carrier, the USS Enterprise, was officially inactivated after a 51-year U.S. Naval career
17. On this day in 2013: China launched Yutu or Jade Rabbit, its first lunar rover, as part of the Chang'e 3 lunar exploration mission.