Fort Washington, Maryland

During the War of 1812, 4,000 veteran Redcoats landed on the Patuxent River, marched in a wide arc around Fort Washington—the only defensive fortification in the area until the Civil War—and burned the Capitol.
https://www.atlasobscura.com/places/fort-washington

Pack a picnic and take advantage of the shade.  There is a $10 entry fee good for multiple days.  The path to the lighthouse is pleasant and the view of the city is picturesque.  Most of the buildings are not open to the public however plan on spending an hour or better walking around the grounds.  This would be the perfect day picnic with the family.

Mailing Address:
13551 Fort Washington Road
Fort Washington, MD 20744
Phone: (301) 763-4600

The Visitor Center and Historic Fort are open daily 9:00 am – 4:30 pm.