The following historic sites have been recognized by the State of Michigan through its historic marker program. Fort St. Joseph. The fort was built in 1686 by the French explorer Duluth. This fort was the second European settlement in lower Michigan. This post guarded the upper end of the St. Clair River, the vital waterway joining Lake Erie and Lake Huron. Intended by the French to bar English traders from the upper lakes, the fort in 1687 was the base of a garrison of French and Indian allies. In 1688 the French abandoned this fort. The site was incorporated into Fort Gratiot in 1814. A park has been established at the former site of the fort. Fort Gratiot Light. The Fort Gratiot Lighthouse was built in 1829 to replace a tower destroyed by a storm. In the 1860s workers extended the tower to its present height of . The light, automated in 1933, continues to guide shipping on Lake Huron into the narrow and swift-flowing St. Clair River. It was the first lighthouse established in the State of Michigan. Lightship Huron. From 1935 until 1970, the Huron was stationed in southern Lake Huron to mark dangerous shoals. After 1940 the Huron was the only lightship operating on the Great Lakes. Retired from Coast Guard Service in 1970, she was presented to the City of Port Huron in 1971. Grand Trunk Railway Depot. The depot, which is now part of the Port Huron Museum, is where 12-year-old Thomas Edison departed daily on the Port Huron–Detroit run. In 1859, the railroad's first year of operation, Edison convinced the railroad company to let him sell newspapers and confections on the daily trips. He became so successful that he soon placed two newsboys on other Grand Trunks running to Detroit. He made enough money to support himself and to buy chemicals and other experimental materials. Port Huron Public Library. In 1902 the city of Port Huron secured money from philanthropist Andrew Carnegie to erect a municipal library and arranged for matching operating funds. In 1904, a grand Beaux-Arts-style structure was built at a cost of $45,000. At its dedication, Melvil Dewey, creator of a widely used book classification system, delivered the opening address. The Port Huron Public Library served in its original capacity for over sixty years. In 1967, a larger public library was constructed. The following year the former library was renovated and re-opened as the Port Huron Museum of Arts and History. An addition was constructed in 1988. Harrington Hotel. The hotel opened in 1896 and is a blend of Romanesque, Classical and Queen Anne architecture. The hotel closed in 1986, but a group of investors bought the structure that same year to convert it into housing for senior citizens. The Harrington Hotel is listed on the National Register of Historic Places. Grand Trunk Western Railroad Tunnel. The tunnel was opened in 1891 and links Port Huron with Canada. This international submarine railway tunnel was the first international tunnel in the world. The tunnel's total length is , with underwater. The tunnel operations were electrified in 1908; half a century later they were converted to use diesel fuel. Tracks were lowered in 1949 to accommodate larger freight cars. During World War I, a plot to blast the tunnel was foiled. A new tunnel has since been opened.
The following historic sites have been recognized by the State of Michigan through its historic marker program. Fort St. Joseph. The fort was built in 1686 by the French explorer Duluth. This fort was the second European settlement in lower Michigan. This post guarded the upper end of the St. Clair River, the vital waterway joining Lake Erie and Lake Huron. Intended by the French to bar English traders from the upper lakes, the fort in 1687 was the base of a garrison of French and Indian allies. In 1688 the French abandoned this fort. The site was incorporated into Fort Gratiot in 1814. A park has been established at the former site of the fort. Fort Gratiot Light. The Fort Gratiot Lighthouse was built in 1829 to replace a tower destroyed by a storm. In the 1860s workers extended the tower to its present height of . The light, automated in 1933, continues to guide shipping on Lake Huron into the narrow and swift-flowing St. Clair River. It was the first lighthouse established in the State of Michigan. Lightship Huron. From 1935 until 1970, the Huron was stationed in southern Lake Huron to mark dangerous shoals. After 1940 the Huron was the only lightship operating on the Great Lakes. Retired from Coast Guard Service in 1970, she was presented to the City of Port Huron in 1971. Grand Trunk Railway Depot. The depot, which is now part of the Port Huron Museum, is where 12-year-old Thomas Edison departed daily on the Port Huron–Detroit run. In 1859, the railroad's first year of operation, Edison convinced the railroad company to let him sell newspapers and confections on the daily trips. He became so successful that he soon placed two newsboys on other Grand Trunks running to Detroit. He made enough money to support himself and to buy chemicals and other experimental materials. Port Huron Public Library. In 1902 the city of Port Huron secured money from philanthropist Andrew Carnegie to erect a municipal library and arranged for matching operating funds. In 1904, a grand Beaux-Arts-style structure was built at a cost of $45,000. At its dedication, Melvil Dewey, creator of a widely used book classification system, delivered the opening address. The Port Huron Public Library served in its original capacity for over sixty years. In 1967, a larger public library was constructed. The following year the former library was renovated and re-opened as the Port Huron Museum of Arts and History. An addition was constructed in 1988. Harrington Hotel. The hotel opened in 1896 and is a blend of Romanesque, Classical and Queen Anne architecture. The hotel closed in 1986, but a group of investors bought the structure that same year to convert it into housing for senior citizens. The Harrington Hotel is listed on the National Register of Historic Places. Grand Trunk Western Railroad Tunnel. The tunnel was opened in 1891 and links Port Huron with Canada. This international submarine railway tunnel was the first international tunnel in the world. The tunnel's total length is , with underwater. The tunnel operations were electrified in 1908; half a century later they were converted to use diesel fuel. Tracks were lowered in 1949 to accommodate larger freight cars. During World War I, a plot to blast the tunnel was foiled. A new tunnel has since been opened.