Fort Mifflin Historic Site on the Delaware

Fort Mifflin is a Revolutionary War-era fortification that resisted a British siege in 1777 and later served in U.S. military use into the 20th century; it is designated a National Historic Landmark. Located on the Delaware Riverfront, the fort's earthworks, barracks, and artillery emplacements are preserved and interpreted by the site, which feels secluded compared with central Philadelphia. Public programs and tours focus on its military history and surviving fortifications.