With its unparalleled views of the Long Island Sound, architectural splendor, and “Great Gatsby” vibes, this park is a popular destination for picnicking, flying kites, birding, fishing, and photography. The park’s crown jewel, Eolia, was the elegant summer mansion of Edward and Mary Harkness, beneficiaries of the oil fortune Edward’s father amassed as a silent partner to John D. Rockefeller ‘s Standard Oil Corporation.