Seminary of the Immaculate Conception

The Joseph Lloyd Manor house is a historical site and Literary Landmark located in Lloyd Harbor, Suffolk County New York. The house was built between 1766 and 1767 on the Manor of Queens Village, a 3,000-acre provisioning plantation established in the late 17th century on the ancestral lands of the Matinecock Nation. The entire estate encompassed all of what is known today as Lloyd Neck. The house was built for Joseph Lloyd (1716–1780) and remained in the Lloyd family for a century before being sold in 1876. It is most significant today for being where Jupiter Hammon (1711–before 1806), the first published Black American poet, was enslaved by the Lloyd family and authored his best-known works. Today, Joseph Lloyd Manor is owned by Preservation Long Island and is used to educate the public about Long Island's colonial and early national history, the region's history of enslavement, and the legacy of Jupiter Hammon.

Lloyd Harbor is a village in the Town of Huntington in Suffolk County, on the North Shore of Long Island, in New York, United States. As of the 2010 census, the village's population was 3,660.

Karpen House is a historic home located at Lloyd Harbor in Suffolk County, New York. It was built in 1955 and is a long, low residence surmounted by a flat roof with overhanging eaves. It represents a vernacular interpretation of the Modern style.It was added to the National Register of Historic Places in 2006.

The Charles Homer Davis House is a historic house located at 381 West Neck Road in Lloyd Harbor, Suffolk County, New York. Once owned by pop star Taylor Dayne (Dayne of Thrones)

Fort Hill Estate is a historic estate located at Lloyd Harbor in Suffolk County, New York. The estate home is a monumental brick and limestone Tudor Revival style structure built as a summer home in 1879, and enlarged in 1900. It is a three-story mansion with an irregular, asymmetrical and sprawling plan which is roughly C-shaped. It features a conical tower built as part of the original structure, designed by McKim, Mead, and White. Also on the estate are a formal garden, a water tower, a superintendent's house, two garages, and a cottage.It was added to the National Register of Historic Places in 1988.

Caumsett State Historic Park Preserve is a state park on Lloyd Neck, a peninsula extending into the Long Island Sound, in the Village of Lloyd Harbor, New York. It is operated by the New York State Office of Parks, Recreation and Historic Preservation. The 1,520-acre (6.2 km2) park covers the former Marshall Field III estate that was developed in the 1920s, and was listed on the National Register of Historic Places in 1979. Much of the park is today managed as a nature preserve, with a focus on protecting high-quality bird habitat.

Cold Spring Harbor Light was a lighthouse located in Cold Spring Harbor on the north shore of New York's Long Island. It was built in 1890 to mark a shoal at the entrance to Cold Spring Harbor. After the lighthouse was deactivated in 1965, the original light and tower were purchased by a private individual and moved to its current location on land, one mile (1.6 km) to the southwest. An automated light tower and day beacon were erected on the original caisson, and continue to serve as a navigation aid.

Van Wyck-Lefferts Tide Mill ( van WYKE) is a historic tide mill located at Lloyd Harbor in Suffolk County, New York. It was built about 1793 and is a 3+1⁄2-story, gable-roofed, timber-framed rectangular building little altered since the early 19th century. The property also includes the earthen mill dam with sluice gates. The Nature Conservancy, which owns the mill, offers free boat tours to the site from May through October.It was added to the National Register of Historic Places in 1978.

Sagamore Hill was the home of the 26th president of the United States, Theodore Roosevelt, from 1885 until his death in 1919. It is located in Cove Neck, New York, near Oyster Bay on the North Shore of Long Island, 25 miles (40 km) east of Manhattan. It is now the Sagamore Hill National Historic Site, which includes the Theodore Roosevelt Museum in a later building on the grounds.

Shore Road Historic District is a national historic district located at Cold Spring Harbor in Suffolk County, New York. The district has 20 contributing residential buildings. They sit at the foot of a steep wooded bluff and date from the early 19th century, the oldest dating to about 1790. It includes works by architect Grosvenor Atterbury.It was added to the National Register of Historic Places in 1985.

Goose Hill Road Historic District is a national historic district located at Cold Spring Harbor in Suffolk County, New York. The district has 11 contributing buildings. It is a small agrarian enclave situated along both sides of a narrow, winding road. The dwellings date from the late 18th to mid-19th century.It was added to the National Register of Historic Places in 1985.

The Cold Spring Harbor Library & Environmental Center is located at Cold Spring Harbor in Suffolk County, New York. It was founded as the Cold Spring Harbor Village Improvement Society in 1899. However, the library, consisting of a small collection of books, was first organized in 1886 and was housed at the Cutting House, 241 Harbor Road, Cold Spring Harbor. This building was located across the street from the local gristmill and the first librarian was the miller's wife, Mrs. Peter Waters. This building is now owned by the Cold Spring Harbor Laboratory.