Fort O'Brien, Military fortification in Machiasport, Maine, United States
Fort O'Brien State Historic Site contains earthworks, a flagpole, and remnants of coastal defense structures along the Machias River banks.
The fort underwent three cycles of construction and destruction between 1775 and 1863, serving during the Revolutionary War, War of 1812, and Civil War.
The site preserves the legacy of colonial resistance through artifacts and structures from different military periods in American history.
Visitors can access the two-acre historic grounds between Memorial Day and Labor Day, with parking facilities near the river location.
A twelve-pound Napoleon cannon from the Civil War period remains at the site, marking its final military configuration.
Location: Maine
GPS coordinates: 44.68944,-67.39667
Latest update: September 23, 2025 14:24
Cobscook Bay State Park
25.8 km
Machiasport Railroad “Lion”
5.1 km
Cross Island National Wildlife Refuge
12.1 km
Roque Bluffs State Park
11 km
Moose Peak Light Shalen’s New Home
26.2 km
Avery Rock Light
5.7 km
Little River Light
16.8 km
Libby Island Light
13.7 km
Ruggles House
26.7 km
Jonesboro Union Church
14.5 km
Union Church
26.6 km
Columbia House
26.6 km
Porter Memorial Library
5.8 km
Machias Post Office and Customhouse
5.7 km
Dennysville Historic District
26.9 km
James R. Talbot House
5.5 km
Whitneyville Congregational Church
8.9 km
Clark Perry House
5.9 km
East Machias Historic District
5.3 km
Machias Valley Grange, No. 360
5.5 km
Gates House
863 m
Washington County Courthouse
5.8 km
Union Meeting House
20.8 km
Jonesboro Grange No. 357
14.2 km
Jasper Beach
7 km
National Wreaths Across America Headquarters
26.7 km
Liberty Hall
914 m
Sandy River Beach
18.9 kmReviews
Visited this place? Tap the stars to rate it and share your experience / photos with the community! Try now! You can cancel it anytime.
Discover hidden gems everywhere you go!
From secret cafés to breathtaking viewpoints, skip the crowded tourist spots and find places that match your style. Our app makes it easy with voice search, smart filtering, route optimization, and insider tips from travelers worldwide. Download now for the complete mobile experience.
A unique approach to discovering new places❞
— Le Figaro
All the places worth exploring❞
— France Info
A tailor-made excursion in just a few clicks❞
— 20 Minutes