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New York, New York
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Castle Williams served as a military prison during the Civil War and later housed prisoners of war.
The circular structure of Castle Williams was designed to deflect cannonballs, making it a formidable defense fortification.
Castle Williams is located on Governors Island, which is part of the Governors Island National Monument managed by the National Park Service.
Visitors to Castle Williams can enjoy panoramic views of the New York Harbor and the Statue of Liberty from its rooftop.
The fort was named after Colonel Jonathan Williams, the first Superintendent of the United States Military Academy at West Point.
Castle Williams was constructed using red sandstone, which gives it its distinctive color and appearance.
