Former site of Fort Sullivan.
Now closed, this US naval prison, known as "The Rock," on Seavey Island in Kittery was the most feared for 66 years. It contained about 86,000 military inmates.
Prisons, Military - Historic - Forts and Batteries
Links: www.tripsavvy.com
By: kjfitz
I recently read a novel which used this as one the settings for a mystery.
Until then, I'd never heard of it.