Built about 1750, Boxwood Hall became the residence of Elias Boudinot, president of the Continental Congress that ratified the Peace Treaty with Great Britain. George Washington visited his friend Boudinot in 1789 on his way to New York for his first inauguration.

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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 (1890–1920) and at Forts Stark, McClary, and Foster.

Website does not specify any interpretive services available at the site.

Double Ditch Indian Village, overlooking the Missouri River, was a large earthlodge village inhabited by Mandan Indians between about 1500 and 1781. The remains of earthlodges, midden mounds (trash heaps), and fortification ditches are clearly visible today. Interpretive signs are posted throughout the site.

The site is open to the public.

Website does not specify any interpretive services available at the site, beyond signage.

Alexander Campbell Mansion, also known as Campbell Mansion or Alexander Campbell House, was the home of Alexander Campbell, founder of Bethany College.

The mansion offers tours.

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Near the site of the battle of Fallen Timbers, this small park contains a monument honoring Major General Anthony Wayne as well as smaller monuments to the soldiers and Native Americans who died in the battle. The battle of Fallen Timbers on 20 August, 1794, was decisive in bringing the Indians of the Northwest Territory to sign the Treaty of Greene Ville. By this treaty the Indians ceded southern and eastern Ohio to settlers. This brief battle, an overwhelming victory for Wayne's forces, was fought in an area recently ravaged by a windstorm, hence the name Fallen Timbers.

Does not provide specifics about interpretative resources available at the site.

Fort O'Brien (Fort Machias) was built in 1775 and destroyed by the British in the same year. This state historic site is one of few Maine forts active during three wars—the American Revolution, the War of 1812 and the Civil War. Fort O'Brien's layout was altered several times over the 90 years it was active on this site; but the fort's important role in protecting the Machias River and its towns remained unchanged. It was refortified in 1777 and destroyed once again by the British in 1814. Well-preserved earthworks which overlook Machias Bay were erected for a battery of guns in 1863. The first naval engagement of the Revolution was fought offshore in 1775, five days before the Battle at Bunker Hill.

The site is open to the public.

Website does not specify any interpretive services available at the site.

Fort Kaskaskia State Historic Site preserves the timeworn earthen remains of Fort Kaskaskia, constructed by the French ca. 1759 to defend the town of Kaskaskia. Today's historic site consists of four major sections: the remains of Fort Kaskaskia, Garrison Hill Cemetery, the Mississippi River overlook and picnic area, and a large campground.

Website does not offer substantive information on interpretative services available at the site.

Museum currently closed for renovations; also check for duplicates in the unpublished historic sites.

The oldest blockhouse in the United States is all that remains of Fort Halifax at the confluence of the Kennebec and Sebasticook Rivers. English settlers built the fort in 1754 to protect colonial settlements along the Kennebec and it served as a garrison for troops from 1754–1766.

Website does not specify any interpretive services available at the site.

The Trail is a 175-mile trail corridor full of cultural and historical significance. It traverses through hundreds of ancient Hawaiian settlement sites and through over 200 ahupua'a, or traditional sea to mountain land divisions. Cultural resources along the trail include several important heiau (temples), royal centers, kahua (house site foundations), loko 'ia (fishponds) ko'a (fishing shrines), ki'i pohaku (petroglyphs), holua (stone slide), and wahi pana (sacred places).

Website does not specify any interpretative services offered by the site.