The Cedar Brook Park Historic District is a designated area located in Plainfield, New Jersey. It features a collection of historic buildings and landscapes that reflect the architectural styles and cultural significance of the early 20th century. The district is known for its beautiful natural scenery, including wooded areas and a serene brook. Established in the 1890s, the park was designed by Frederick Law Olmsted Jr., a prominent landscape architect. The district includes various recreational facilities, walking paths, and picnic areas, making it a popular destination for both residents and visitors seeking outdoor activities and historical exploration.