Baltimore's Fort McHenry is celebrating Defenders Day.
The weekend's celebration commemorates the Battle of Baltimore, during which the city was successfully defended against a British attack during the War of 1812.
The Battle of Baltimore led Francis Scott Key to write the now iconic lyrics to the "Star-Spangled Banner.''
Key saw Fort McHenry's flag still waving on the morning after the British attack and was inspired to write the words.
Fort McHenry will have celebrations all weekend long.
On Saturday evening, the fort will fly for the first time a flag like one that flew over the fort during the War of 1812. It was made by hand at the Maryland Historical Society.
The festivities include military drills, cooking demonstrations, and musket and cannon firings.