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New York, United States
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501 Hay Rd, New York, NY 10004, USA
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N40° 41' 34" W74° 1' 9"
(40.692777777778, -74.019166666667)
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Castle Williams is a circular fortification of red sandstone on the northwest point of Governors Island, part of a system of forts designed and constructed in the early 19th century to protect New York City from naval attack. It is a prominent landmark in New York Harbor. Together with Fort Jay (Fort Columbus), it is managed by the National Park Service as part of Governors Island National Monument.