Fort Mifflin

Originally called Fort Island Battery and also known as Mud Island Fort, Fort Mifflin was built between 1771 and 1776 and is located on Mud Island in the Delaware River near Philadelphia, Pennsylvania. During the Revolutionary War, Fort Mifflin was the site of a siege, which ended with the British controlling the fortifications. The fort was rebuilt in 1794, housed prisoners during the Civil War, and remained an active military base until 1962. Today, the site is a National Historic Landmark and offers tours of the grounds.