Fort Michie

Great Gull Island is a 17-acre (6.9 ha) island separating the Long Island and Block Island sounds, located approximately 0.4 miles (0.6 km) southwest of Little Gull Island. Both islands are located in the town of Southold in Suffolk County, New York, and lie roughly midway between Plum Island and Fishers Island. The island is the location of former military fortifications, but is now owned by the American Museum of Natural History which is working to restore its ecosystem. It hosts many nesting Common and Roseate terns.

Little Gull Island Light is a lighthouse on Little Gull Island, a small island in Long Island Sound, located approximately 0.4 miles (0.6 km) northeast of Great Gull Island. Both islands are located in the Town of Southold, in Suffolk County, New York, and lie roughly midway between Plum Island and Fishers Island. Little Gull Island is approximately 4.6 miles (7.4 km) southwest of Fishers Island and the channel of water between them is the main entrance to Long Island Sound, known as "The Race". The lighthouse, which was built in 1869 and automated in 1978, occupies much of the rocky island, which is only about 1-acre (4,000 m2) in size.

Gardiners Point Island is an island in Block Island Sound, New York, that was the former location of the Gardiners Island Lighthouse as well as Fort Tyler. Once a peninsula of Gardiners Island – permanently detached in 1888 by a storm – it had an area at least as large as 14 acres. Today it is part of the Long Island National Wildlife Refuge Complex, reduced, however, to a relative speck consisting of the foundations of the fort. It is locally referred to as "The Ruins". The island is under the jurisdiction of East Hampton, New York.

Plum Island is an island in the town of Southold in Suffolk County, New York. The island is situated in Gardiners Bay, east of Orient Point, off the eastern end of the North Fork coast of Long Island. It is about 3 miles (4.8 km) long and 1 mile (1.6 km) wide at its widest point. Plum Island is the site of the Plum Island Animal Disease Center (PIADC), which was established by the United States Department of Agriculture (USDA) in 1954. The Island is also the site of the former U.S. military installation Fort Terry (c. 1897), and the historic Plum Island Light (c. 1869), and its automated replacement. Plum Island is owned in its entirety by the United States government, which was considering sale of the island, but suspended the plan in February 2012. Access to the island is controlled by the United States Department of Homeland Security (DHS). On August 29, 2013, the United States General Services Administration (GSA) and United States Department of Homeland Security (DHS) announced a final "Record of Decision (ROD): Public Sale of Plum Island, New York". After years of pressure from organizations including the Preserve Plum Island Coalition (PPIC), the Connecticut Fund for the Environment, along with its permanent regional program Save the Sound and Soundkeeper, Inc., Congress voted in December 2020 to block the sale and preserve Plum Island. In 2020, President Donald Trump signed the legislation.

John Milton, a 1,444-ton vessel built in Fairhaven, Massachusetts, was wrecked on February 20, 1858 5 nautical miles (9 km) west of the Montauk Lighthouse, killing all 32 or 33 people on board, in one of the worst maritime disasters off the east coast of on Long Island, New York. Built in 1854, John Milton was captained by Ephraim Harding of Martha's Vineyard, with its home port at New Bedford, Massachusetts. The 43-year-old Harding was born in New Bedford. Also on board was the captain's teenage son, Rudolphus Hancock Harding. The ship left New York City on December 6, 1856. After loading a cargo of guano at the Chincha Islands in the Pacific Ocean off the coast of Peru, she returned to the United States from South America, stopping at Norfolk, Virginia, on February 14, 1858. She sailed northeast two days later, presumably heading for New York City. A blinding snowstorm and gale sprang up, and temperatures plunged to 8 °F (−13 °C). Captain Harding may have confused the Shinnecock Lighthouse at Ponquogue Point in Hampton Bays, which had been erected in his absence, for the Montauk Light, and ran aground off the shore at what is known today as "Ditch Plains". The frozen bodies of 24 sailors washed ashore and were buried at the South End Burying Ground in East Hampton, New York, where there is a marble monument today. Harding's body was identified, but his son's was never found. Capt. Harding's body was returned home and is buried in the Village Cemetery in Vineyard Haven, MA.

Fort Terry was a coastal fortification on Plum Island, a small island just off Orient Point, New York, United States. This strategic position afforded it a commanding view over the Atlantic entrance to the commercially vital Long Island Sound. It was established in 1897 and used intermittently through the end of World War II. In 1952, it became a military animal and biological warfare (BW) research facility, moving to civilian control in 1954 as the Plum Island Animal Disease Center. Despite the new civilian control, the biological warfare mission continued until 1969, when the US officially ended offensive BW research. The island is now being considered for sale or conversion to a wildlife refuge. Fort Terry was listed on the National Register of Historic Places in 2021.

Race Rock Light is a lighthouse on Race Rock Reef, a dangerous set of rocks on Long Island Sound southwest of Fishers Island, New York and the site of many shipwrecks. It is currently owned and maintained by the New London Maritime Society as part of the National Historic Lighthouse Preservation Act program.Race Rock Light was built 1871–78 and designed by Francis Hopkinson Smith (1838–1915). It is an excellent example of 19th-century engineering and design. The massive masonry foundations on the reef took seven years to complete, but the stone structure, the keeper's quarters, and the tower were built in only nine months once the foundation was secure. The lighthouse has a fourth-order Fresnel lens in a tower standing 67 feet (20 m) above the waterline. The United States Coast Guard automated the light in 1978.Race Rock Lighthouse was added to the National Register of Historic Places in 2005.

Plum Island Animal Disease Center (PIADC) is a United States federal research facility dedicated to the study of foreign animal diseases of livestock. It is a national laboratory of the Department of Homeland Security (DHS) Directorate for Science and Technology (S&T), and operates as a partnership with the U.S. Department of Agriculture (USDA). The facility's director is Larry Barrett. Isolated on Plum Island off the eastern tip of Long Island, New York, the center has been tasked with protecting America's livestock from animal diseases since 1954. It is the only facility in the country authorized to work with live foot-and-mouth disease (FMD) samples, and specializes in the study of FMD and African swine fever. At the height of the Cold War, study of biological weapons for use against livestock was conducted at the site, ending in 1969 when President Nixon declared an end to the United States' offensive bioweapons program. Today the facility maintains laboratories up to biosafety level 3, and has remained controversial as a result of its high-risk work and proximity to the New York metropolitan area. The facility is slated for closure in 2024, with work moving to the National Bio and Agro-Defense Facility under construction in Manhattan, Kansas.

USS G-2 (SS-27) was a G-class submarine of the United States Navy. While the four G-boats were nominally all of a class, they differed enough in significant details that they are sometimes considered to be four unique boats, each in a class by herself. G-2 was named Tuna when her keel was laid down on 20 October 1909 by the Lake Torpedo Boat Company in Bridgeport, Connecticut, making her the first ship of the United States Navy to be named for the tuna, a large, vigorous, spiny-finned fish highly esteemed for sport and food. She was renamed G-2 on 17 November 1911, launched on 10 January 1912 sponsored by Ms. Marjorie F. Miller, towed to the New York Navy Yard after the termination of the Lake contract on 7 November 1913 where she was completed, and commissioned on 1 December 1913.

The Seaside is a historic medical facility at 36 Shore Road in Waterford, Connecticut. It is nationally significant as the first institution designed for heliotropic treatment of children suffering from tuberculosis. Its buildings "comprise an exceptional collection of fully realized and generally well-preserved Tudor Revival-style institutional architecture", which were designed by Cass Gilbert. The property was listed on the National Register of Historic Places in 1995.

Fort H. G. Wright was a United States military installation on Fishers Island in the town of Southold, New York, just two miles off the coast of southeastern Connecticut, but technically in New York. It was part of the Harbor Defenses of Long Island Sound, along with Fort Terry, Fort Michie, and (in World War II) Camp Hero. These forts defended the eastern entrance of Long Island Sound and thus Connecticut's ports and the north shore of Long Island. The fort was named for Union General Horatio G. Wright, a former Chief of Engineers who was born in Clinton, Connecticut.The fort was first developed in the early 20th century and was active in the First and Second World Wars. After the Second World War, it was deactivated as a coast defense fort.

Harkness Memorial State Park is a historic preservation area with botanical garden and recreational features located on Long Island Sound in the town of Waterford, Connecticut. The state park's 304 acres (123 ha) center around Eolia, a 42-room Renaissance Revival mansion with formal gardens and greenhouses. The park is managed by the Connecticut Department of Energy and Environmental Protection.