The Rockefeller Estate, also known as Kykuit, is a historic mansion located in Sleepy Hollow, New York. Built in the early 20th century, it served as the home of the Rockefeller family, including John D. Rockefeller, the founder of Standard Oil. The estate features beautiful gardens, art collections, and stunning views of the Hudson River. Today, the Rockefeller Estate is part of the National Trust for Historic Preservation and is open to the public for tours. Visitors can explore the mansion, its grounds, and learn about the history of the Rockefeller family and their contributions to American society.