1. Battle of Monocacy: On June 28, 1864, the Union and Confederate armies clashed in the Battle of Monocacy near present-day Frederick, Maryland. Despite being outnumbered, Union General Lew Wallace was able to delay the Confederate advance and prevent them from capturing Washington D.C.

2. Babe Ruth's Birthday: On June 28, 1895, baseball legend Babe Ruth was born in Baltimore, Maryland. Ruth played for the Baltimore Orioles before being traded to the Boston Red Sox in 1914.

3. National Cryptologic Museum Opens: The National Cryptologic Museum, located in Fort Meade, Maryland, opened on June 28, 1993. The museum features exhibits on the history of cryptology and the role it has played in national security.

4. First Lady Visits Annapolis: On June 28, 1982, First Lady Nancy Reagan visited the United States Naval Academy in Annapolis, Maryland. She spoke at the Academy's graduation ceremony and met with midshipmen and their families.

5. Harriet Tubman Statue Unveiled: A statue of civil rights icon Harriet Tubman was unveiled in Cambridge, Maryland on June 28, 1979. Tubman, who escaped slavery in Maryland and went on to become a leader of the Underground Railroad, is celebrated for her courage and determination in the fight for freedom.