Fort Constitution State Historic Site is located on a peninsula on the northeast corner of New Castle Island. It overlooks both the Pisquatua River and the Atlantic Ocean. Fort Constitution is one of seven forts built to protect Portsmouth Harbor. The earliest forts were built to protect the colonists. As Portsmouth Harbor's importance increased with the Revolutionary War shipbuilding industry and the establishment of the Portsmouth Naval Shipyard in 1800, additional fortification was needed. Following the Spanish American War (1898) the improved defense of key harbors became a national priority. Fortifications such as Fort Constitution were constructed on both coasts during the Endicott Period (18901920) and at Forts Stark, McClary, and Foster.
Website does not specify any interpretive services available at the site.