1. On December 14, 1799, George Washington died at his Mount Vernon estate in Virginia. While Washington was not born in Washington, D.C., his leadership and role in the American Revolution and early days of the United States shaped the nation's capital's history.

2. One of the deadliest fires in Washington, D.C.'s history occurred on December 14, 1932. The Knickerbocker Theatre, located at 18th Street NW and Columbia Road in the Adams Morgan neighborhood, collapsed during a movie screening due to heavy snowfall on the building's flat roof. 98 people were killed, and over 130 were injured.

3. A significant event in Washington sports history occurred on December 14, 1997, when the Washington Redskins played their final game at RFK Stadium. The Redskins defeated the Dallas Cowboys 37-10 in front of over 55,000 fans, capping off their final season at the stadium.

4. December 14, 1918, marked the first U.S. airmail service between New York City and Washington, D.C. The inaugural flight was flown by Army pilot Lt. George L. Boyle, who arrived in Washington the same day after departing from Belmont Park, New York.

5. On December 14, 1911, the National Museum of Natural History opened its doors in Washington, D.C. The museum is part of the Smithsonian Institution and is home to millions of specimens, including dinosaur fossils, gems, and minerals. It is one of the most visited natural history museums in the world.