An old fort with five exposed batteries and a bunker, most interconnected. Very easy to get to with some parking onsite. If you go there at night (the park is open), avoid the police round at sundown that throws everyone out. Once they're gone, they don't come back unless somebody is noisy. Alternatively, you can officially request access, but it takes time. Great spot for night photography and light painting.
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Drive up and park right there, walk down the stairs. 42.304680, -70.903387