The oldest building in the park, the Blockhouse was one of three constructed hastily in September of 1814 as a fortification against the British invasion of New York City. The builders were volunteers and worked quickly, as is evident in the unevenness of the stone facade. Only a shell of the blockhouse remains; the interior is not open to visitors. Getting to the blockhouse requires taking winding paths through a heavily wooded area and should not be attempted alone.
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