Kykuit, also known as the Rockefeller Estate, is a historic mansion located in Sleepy Hollow, New York. Built in the early 20th century, it served as the summer home for the Rockefeller family, one of America's wealthiest families. The estate features beautiful gardens, impressive art collections, and stunning views of the Hudson River. The mansion is part of the Historic Hudson Valley and is open to the public for tours. Visitors can explore the grand rooms, learn about the family's history, and enjoy the extensive grounds, which include sculptures and landscaped gardens designed by renowned landscape architects.