Roosevelt Island is a 147-acre urban enclave in New York City's East River that functions as a self-contained residential community with unique landmarks. At the southern tip is the Franklin D. Roosevelt Four Freedoms State Park, a stunning architectural memorial designed by Louis Kahn. Nearby sit the haunting ruins of the Renwick Smallpox Hospital, the only landmarked ruin in the city. The island's "Main Street" features a mix of modernist apartment blocks, a local library, and small cafes. Towards the center is the massive Cornell Tech campus, representing a high-fidelity hub of innovation. Further north, you will find The Octagon, a former 19th-century mental health hospital that has been converted into a luxury, eco-friendly residential building. The northern tip is anchored by the Roosevelt Island Lighthouse, built in 1872. Accessible via the iconic red aerial tramway from Manhattan, the island offers a "car-free" feel with scenic waterfront promenades that provide some of the best panoramic views of the Midtown skyline and the United Nations headquarters.