Fort McKinley, Maine, Military heritage site on Great Diamond Island, Maine, United States.
Fort McKinley extends across 111 acres of Great Diamond Island, featuring artillery emplacements, barracks, and officers' quarters from the coastal defense era.
Built between 1890 and 1900, the fort housed nine gun batteries with 12-inch mortars and operated until 1947 as part of the Harbor Defenses of Portland.
The Fort McKinley Museum displays military artifacts and organizes historical presentations about the fort's role in American coastal defense systems.
Visitors can access the fort via ferry from Portland, with guided tours available Friday through Sunday from 10:30 AM to 2:30 PM during summer months.
The fort complex includes a sub-post called Fort Lyon on nearby Cow Island, which now functions as an environmental education center.
Location: Maine
GPS coordinates: 43.67917,-70.19722
Latest update: March 7, 2025 23:27
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