The fort grounds were designated a National Historic Landmark in 1960. It is a popular tourist attraction as part of Colonial Michilimackinac State Park in Mackinaw City, a major section of the Mackinac State Historic Parks. Interpreters, both paid and volunteer, help bring the history to life, with music, live demonstrations and reenactments, including musket and cannon firing demonstrations. The site has numerous reconstructed historical wooden structures. It is considered one of the most extensively excavated early French archaeological sites in the United States.
The fort grounds also contain the foot of the Mackinac Bridge, Old Mackinac Point Light, which is an 1892 lighthouse, and a day-use park with a great view of the Mackinac Bridge and Mackinac Island.
Being that this is designated as a National Historic Landmark I believe that it is closed to MD.
Good Luck