1. Maryland became a state: March 25, 1634 marks the day that Lord Baltimore's fleet of ships arrived in the Chesapeake Bay, establishing the colony of Maryland. It was named in honor of Henrietta Maria, the queen consort of England and wife of King Charles I.

2. First Catholic Parish established: March 25, 1662 saw the establishment of the first Catholic parish in Maryland, known as St. Inigoe's. It was located in St. Mary's County and was named after the patron saint of Loyola.

3. Harriet Tubman Day in Maryland: On March 25, 2017, Maryland Governor Larry Hogan signed a proclamation declaring March 25 as Harriet Tubman Day in the state of Maryland. Tubman, a former slave and abolitionist, was born in Dorchester County, Maryland, and played a key role in the Underground Railroad.

4. Naval Academy founded: The United States Naval Academy was founded in Annapolis, Maryland on March 25, 1845. It has since become one of the nation's most prestigious military institutions, focused on producing officers of the highest caliber.

5. Maryland Day: Each year on March 25, Maryland celebrates its heritage and history with the annual observance of Maryland Day. Activities and events vary from one year to the next but generally include tours of historic sites, reenactments, and children's programs.