State Historic Site - NYS Parks, Recreation & Historic Preservation Ogden Mills & Ruth Livingston Mills State Park - NYS Parks, Recreation & Historic Preservation Friends of Mills Mansion Museums in Hyde Park, New York New York (state) historic sites McKim, Mead & White buildings Historic house museums in New York (state) Houses in Hyde Park, New York Livingston family residences Protected areas established in 1938 1938 establishments in New York (state) Gilded Age mansions