Governors Island National Monument

Governors Island National Monument comprises historic military sites on Governors Island in New York Harbor, including two early-19th-century coastal forts. The monuments preserve Fort Jay and Castle Williams and interpret the island’s role in U.S. coastal defence.

Visitors can tour masonry fortifications, see restored officers’ housing along Colonel’s Row and walk historic parade grounds and defensive works. Guided tours and interpretive signage explain 18th- and 19th-century military architecture and the island’s use over time.

The island hosted military fortifications and garrisons from the late 18th century through the 20th century; the present Fort Jay and Castle Williams date largely to the early 1800s. The site was designated a national monument to protect these structures and their historical context.

Sited in New York Harbor, Governors Island lies just off Lower Manhattan and is reached by short ferry from Manhattan and Brooklyn; the island is used primarily for public recreation and historic interpretation during its open season.

• Ferry access and seasonality: Access is by public ferry from Manhattan and Brooklyn; hours and frequency are seasonal so check schedules before travel.
• Two preserved forts: The national monument protects two early-19th-century forts and associated military buildings and is usually visited as part of a day-trip to Governors Island.

What to See #

• Fort Jay: Fort Jay - a star-shaped fort whose current masonry work dates largely from the early 19th century and that served as a defensive and administrative post for the island.
• Castle Williams: Castle Williams - a circular masonry fort built in the early 19th century, originally intended to defend New York Harbor and now preserved as a ruin-like monument.
• Colonel's Row and historic houses: Colonel's Row and historic officers' houses - a line of 19th-century houses that illustrate the island's former military residential area and are often part of guided tours.