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Fort Warren was built to withstand an enormous invasion.
The entrance boasted a wire door that soldiers could pull down, trapping invaders in the entry tunnel called the sallyport. Small holes, called murder holes, were carved in the granite blocks that line the tunnel. The holes reach directly into the captain’s quarters, where officers could shoot at trapped imposters like fish in a barrel.
Visit Massachusetts with Atlas Obscura Trips
Fishing Traditions and Marine Ecology in Martha's Vineyard
Set sail, September 12–15, with a seasoned local fisherman, reel in the ocean’s freshest fare, and explore the history and ecology of Martha’s Vineyard’s beaches, hatcheries, and wildlife sanctuaries.