October 18 is an important date in the history of District Of Columbia. Here are five interesting facts about this day:

1. In 1899, the Washington Post published its first Sunday edition. The newspaper, which was founded in 1877, added the Sunday edition to meet the growing demand for news from the nation's capital.

2. On October 18, 1930, the first flight from Washington, D.C., to New York City took off. The flight, operated by Eastern Air Lines, took 2 hours and 20 minutes to complete and marked a significant milestone in the history of air travel.

3. In 1962, the Cuban Missile Crisis began. The conflict between the United States and the Soviet Union over the placement of nuclear missiles in Cuba lasted for 13 days and brought the world to the brink of nuclear war.

4. On October 18, 1987, tens of thousands of protesters marched on the National Mall to demand an end to nuclear weapons. The protest, which was organized by the anti-nuclear group "No More Hiroshimas," was one of the largest anti-nuclear demonstrations in U.S. history.

5. In 2007, the Smithsonian's National Museum of the American Indian opened on the National Mall. The museum, which was designed by a Native American architect, features exhibitions and artifacts that explore the history and culture of Native Americans.