1. The Hotel Washington opened its doors on March 15, 1918. This historic hotel was one of Washington, D.C.'s most iconic landmarks and hosted a variety of notable guests over the years, including Winston Churchill and John F. Kennedy.

2. On March 15, 1977, a massive winter storm known as the "Washington's Birthday Weekend Snowstorm" hit the city, dumping up to 18 inches of snow in some areas. The storm caused chaos and brought the city to a standstill for several days.

3. On March 15, 1995, the FBI arrested Timothy McVeigh, the man responsible for the Oklahoma City bombing, at a rest stop in Oklahoma. McVeigh's actions resulted in the deaths of 168 people and injured countless others, making this one of the darkest days in Washington, D.C. history.

4. The first automobile tunnel in the United States opened in Washington, D.C. on March 15, 1945. The 3,750-foot-long tunnel connected Dupont Circle to the Rock Creek Parkway and significantly eased traffic congestion in the city.

5. On March 15, 1820, Maine became the 23rd state in the United States when it was admitted to the Union. Although not technically a Washington, D.C. event, the addition of Maine as a state influenced the politics and development of the entire United States, including the District of Columbia.