This 27-acre property was made famous by Teddy Roosevelt, who visited the area beginning in 1878. As a young man under the guidance of his lifelong friend and guide Bill Sewall, Roosevelt camped at the southern end of Mattawamkeag Lake and hunted and fished throughout the area. It was reported that, each day, Roosevelt would take his bible and hike to a beautiful point of land at the confluence of the West Branch of the Mattawamkeag River and First Brook where he would read the bible. A plaque at the site commemorates Roosevelt's love for the area.

The site is open to the public.

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

Built between 1905 and 1912 and named for Jeduthan Baldwin, an engineer for the Colonial army during the Revolutionary War, Fort Baldwin originally consisted of three batteries (Cogan, Hardman, and Hawley). Battery Cogan had two three-inch guns, Battery Hardman had one six-inch disappearing gun, and Battery Hawley had two six-inch pedestal guns. All of these guns were removed in July 1924. During the First World War, Forts Baldwin and Popham held a garrison of two hundred soldiers including the 13th and 29th Coast Artillery. During the Second World War, D Battery, 8th Coast Artillery manned the fort from 1941 to 1943.

The site is open to the public.

Website does not specify any interpretive services 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.

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.

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 the 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. In 1923, the United States Government deeded the site of Fort O'Brien to the State of Maine. First administered as a State Historic Site in 1966, it is now maintained by the Bureau of Parks and Lands.

Website offers no specifics on services offered at the site.