The Stonewall Inn is perhaps the best-known gay historical site in the United States. Riots that erupted there at the end of June 1969 — when patrons fought back against a police raid — are widely hailed as the catalyst for the modern movement for lesbian, gay, bisexual and transgender rights.

Last year, President Barack Obama designated the bar and an adjoining park as a National Historic Monument.

But L.G.B.T. history in New York City goes back much further. For the last several years, the NYC LGBT Historic Sites Project has worked to map the city’s role in that history, which “is really not known that well, and it is really hard to document,” said Ken Lustbader, the co-director of the organization.

There were only two L.G.B.T. historical sites out of the roughly 92,000 sites on the National Register of Historic Places when the NYC LGBT project began in 2014, Mr. Lustbader said. His group received a grant from the National Park Service to add five more gay and transgender sites to the register. So far, three have been added: the Greenwich Village gay bar Julius’, the Chelsea home of civil rights leader Bayard Rustin and the Staten Island home of photographer Alice Austen.

“L.G.B.T. history is American history, and the contributions of L.G.B.T. Americans to the wider culture have been huge,” he said. “If you took them away I don’t know what America would look like.”

Below are some of the NYC LGBT Historical Project sites:

Julius’

A “sip in” protest at this bar in 1966 by the Mattachine Society, one of the country’s first gay rights groups, helped end a state policy that revoked the liquor licenses of bars that served known or suspected gay people.

Greenwich Village Waterfront

The waterfront at the end of Christopher Street has been an important gathering place for L.G.B.T. people for more than a century: a place where they could socialize, look for love and politically organize.

Bayard Rustin House

Rustin, an African-American civil rights leader, lived in Chelsea from 1963 until his death in 1987. From this apartment he helped organize the 1963 March on Washington for Jobs and Freedom and worked to integrate the New York City school system.

Lesbian Herstory Archives

This volunteer-based museum and community center was founded in Manhattan in 1974 and moved to Brooklyn in 1993. It houses one of the world’s largest collections of lesbian history, including 11,000 books dating to the 19th century.

Alice Austen House

Austen, a late 19th- and early 20th-century photographer who captured images of New York’s lesbian communities at the turn of the century, lived at this Staten Island house with her partner of 53 years, Gertrude Tate. Today it is a museum.

Langston Hughes Residence

Langston Hughes, a leading figure of the Harlem Renaissance, wrote several books while living in this Harlem rowhouse from 1947 to 1967, including “Montage of a Dream Deferred” and “I Wonder as I Wander,” his second autobiography.

Student Homophile League at Columbia University

Students at Columbia University founded the country’s first gay student organization in 1966 and held meetings and social events in Earl Hall. A formal gay lounge was established in Furnald Hall in 1971.

The Starlite Lounge

Harold Harris, an openly gay African-American businessman also known as Mackie, opened this straight-friendly gay bar in 1962, a time when the Mafia controlled gay night life. It was a pillar of the black L.G.B.T. community until it closed in 2010.

Christine Jorgensen Childhood Residence

Christine Jorgensen became one of the most famous people in the world when she had gender reassignment surgery in Denmark in 1952. Reporters swarmed her home in the Bronx, where she had lived since 1926, when she returned to the United States.

Franklin E. Kameny Childhood Residence

Franklin E. Kameny, whose activism helped lead to the end of a federal ban on gay employees and the end of the medical classification of homosexuality as a mental illness, lived here from 1925 to 1948. He helped popularize the slogan “Gay is good.”

Bum Bum Bar

This bar has been a social center for a mostly Latina lesbian community since it opened in the early 1990s. Today it is one of only four lesbian bars in New York City.

Riis Beach

The eastern end of the beach at Jacob Riis Park has been a popular site for L.G.B.T. sunbathing and socializing since the 1940s. At times it has affectionately been called “Screech Beach.” It has long been one of the most popular gay beaches in New York.

Transy House

This house was a transgender collective from 1995 to 2008. It was a center for political organizing, provided a home to many transgender people in need, and was the last residence of Sylvia Rivera, a pioneering L.G.B.T. activist.

Metropolitan Community Church of New York

Founded in 1972 to minister to the L.G.B.T. community, the church moved to this location in 1994. Its food pantry and youth center are named in honor of Sylvia Rivera, a longtime parishioner.