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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.

Buttermilk Channel is a small tidal strait in Upper New York Bay in New York City, approximately 1 mile (1.6 km) long and 0.25 miles (0.40 km) wide, separating Governors Island from Brooklyn. The channel is marked by a number of navigation aids (green cans no. 5 and 7 at the northeast entrance, and green gong no.

The Admiral's House, also known as Building 1, is a historic building located in the Nolan Park area of Governors Island in New York Harbor. It was originally designed by Martin E. Thompson in the Greek Revival style, and completed in 1843. The Admiral's House is both on the National Register of Historic Places and a New York City designated landmark.

Governors Island National Monument, a unit of the United States national park system, is located in New York City on 22 acres (89,000 m2) of Governors Island, a 172-acre (0.70 km2) island located off the southern tip of Manhattan Island at the confluence of the Hudson and East Rivers in New York Harbor.

Governors Island is a 172-acre (70 ha) island in New York Harbor, within the New York City borough of Manhattan. It is located approximately 800 yards (732 m) south of Manhattan Island, and is separated from Brooklyn to the east by the 400-yard-wide (370 m) Buttermilk Channel. The National Park Service administers a small portion of the north of the island as the Governors Island National Monument, including two former military fortifications named Fort Jay and Castle Williams.

Fort Jay is a coastal star fort and the name of a former United States Army post on Governors Island in New York Harbor, within New York City. Fort Jay is the oldest existing defensive structure on the island, and was named for John Jay, a member of the Federalist Party, New York governor, Chief Justice of the Supreme Court, Secretary of State, and one of the founding fathers of the United States.

The Columbia Street Waterfront District is a neighborhood in the borough of Brooklyn in New York City on the Upper New York Bay waterfront between Cobble Hill and Red Hook and situated on the western side of the Brooklyn–Queens Expressway (BQE). The neighborhood is locally governed by Brooklyn Community Board 6.

The Block House, also known as Building 9 and the Governors Island Post Hospital, is a brick building in the Nolan Park area of Governors Island in New York Harbor, New York City. Its name is due to its early use as a prison. Ulysses S. Grant was briefly stationed there early in his military career.

The Governor's House, also known as Building 2, is a historic house on Governors Island in New York City. It was added to the National Register of Historic Places in 1973.The Governor's House was built c. 1805–1813, during the War of 1812 and was originally known as the Guard House. It is the oldest structure on the island that is not a fortification, but contrary to popular misconception, is not the Colonial Governor's Mansion, which was built in 1702.

Liggett Hall, also known as Building 400 is a former barracks building designed by McKim, Mead & White and built in 1929 near Fort Jay on Governors Island in New York Harbor, in New York City. The Georgian Revival building is three to ​4 1⁄2 stories tall and measures 1,023 feet (312 m) long.