The LIM's mission is to inspire people of all ages with an understanding and enjoyment of American art, history, and carriages as expressed through the heritage of Long Island and its diverse communities.

Lempfert, avid hunter and taxidermist, displayed his hunting trophies and specimens at friend Archie Rayner's home.

Persuaded by Mrs. Melville, the collection was moved to an empty building known as the Stone Jug, owned by local pharmacist Charles J. Zimmerlein.

This allowed for the expansion of the museum and its growing collections that correlated with his goals of renovating Stony Brook into a more historic-looking village.

The expanded space also accommodated Ward Melville's interest in horses and pleasure driving with the construction of the Carriage House.

During the 1950s a number of period buildings were moved to the museum's grounds including the late nineteenth-century Samuel H. West Blacksmith Shop located in Setauket, Long Island.

Like the Nassakeag Schoolhouse and the Samuel H. West Blacksmith Shop, museum educators conduct programs throughout the school year for students within and around the barn.

In 1973, this desire led to the completion of the Art Museum, which was designed by Becker & Arelt to be located on the east end of the grounds.

The grounds also feature outdoor sculpture (both permanent and temporary), a cemetery, gardens, outhouse, and a Beaux Arts horse fountain that once resided at the intersection of Madison Avenue and 23rd Street in New York City.

The museum's extensive archives, housed in the Kate Strong Historical Library, contain letters, diaries/journals, ledgers, and other assorted paper artifacts that tell the history of the region and the people that lived and worked in it.

Informational resources are readily available to support the work of its staff and meet the research needs of scholars and the general public.

Dance of the Haymakers (1845), Farmers Nooning (1836), and The Banjo Player (1855) are just three of the more notable Mount paintings in the museum's extensive collection.

Its holdings include over 10,000 historic textiles from the eighteenth century to present and features men's, women's, and children's clothing.

The collection holds over 210 folk art wildfowl decoys made by Long Island craftsmen and other noted eastern carvers.

This omnibus was operated by the Huntress family who owned a livery business in South Berwick, Maine from the 1860s to 1904 before being acquired by the St. Paul's school to transport athletic teams to sporting events.

The Wells Fargo Overland Express Company figured prominently in America's westward expansion by providing coach transportation for passengers and mail and operated banking offices throughout the West.

This particular heavy type of mud wagon was manufactured by Abbot-Downing Company and painted in the Wells Fargo standard red and yellow while being devoid of any decoration and luxury components.

These four state coaches belonged to Prince Albert of Bavaria (1818–1875), the youngest son of King Ludwig I of Wittlsbasch Dynasty.

In addition to the LIM's permanent and changing exhibitions, a range of educational programs provide life-long learning opportunities including workshops, family festivals, and lectures.

The Education Department collaborates with facilities that work with this population in an interactive exhibition experience that sparks imagination and encourages participation.