The less seen northern edge of Roosevelt Island

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Lighthouse Park is a three-acre public green space situated at the northern tip of Roosevelt Island, where the East River meets the Harlem River and transitions into the Hell Gate channel. Positioned away from the higher-density traffic of the island's southern sector, the park serves as a historical and cultural site featuring open green space, a 19th-century maritime landmark, and a major public monument. The open geography of the peninsula provides direct views of the surrounding river channels and municipal waterways, distinguishing it from more conventional, highly developed urban parks.

The center of the park features "The Girl Puzzle," a permanent public art installation by sculptor Amanda Matthews. Formally dedicated in 2021, the monument consists of multiple seven-foot-tall bronze faces arranged to honor investigative journalist Nellie Bly. The installation is structurally and historically linked to The Octagon, a nearby residential building that preserves the remaining octagonal entry rotunda of the former New York City Lunatic Asylum. In 1887, Bly feigned insanity to gain access to the asylum, subsequently publishing "Ten Days in a Mad-House," a landmark exposé that documented the institutional mistreatment of marginalized women and triggered significant municipal reform.

At the northernmost stone edge of the park stands the Blackwell Island Light, a 50-foot Gothic Revival lighthouse completed in 1872. Constructed by the city using stone quarried on the island and labor from local institutional inmates, the tower was designed to navigate the turbulent waters of the East River approach. Though historical folklore attributed its construction to a single asylum patient fortifying the point against British ships, official records confirm it was a municipal public works project designed by supervising architects. The lighthouse was officially decommissioned from active maritime service in the 1970s and currently stands as a landmarked historical structure.