September 16 is a significant day in the history of the District of Columbia. Here are five interesting facts about this day:

1. In 1791, President George Washington officially declared the site for the new capital of the United States, which would later become Washington DC. This was a significant moment in the history of the city, and the nation as a whole.

2. On September 16, 1830, the first steam locomotive in the United States, the Tom Thumb, made its inaugural run in Washington DC. The locomotive was built by Peter Cooper and transported passengers and cargo between Baltimore and Washington DC.

3. In 1908, the Wright Brothers demonstrated their flying machine in Washington DC for the US Army. The event attracted a huge crowd, and marked the beginning of the aviation industry in the United States.

4. In 1972, the Watergate burglars were sentenced to prison for their role in the break-in at the Democratic National Committee headquarters at the Watergate complex in Washington DC. This event led to the downfall of President Richard Nixon and is considered one of the most significant political scandals in US history.

5. September 16 is also the birthday of US Supreme Court Justice Antonin Scalia, who served on the court from 1986 until his death in 2016. Scalia was known for his conservative views and for his opinions on issues such as gun rights, religious freedom, and affirmative action.