Once part of Audubon's estate, it is now home to three museums: American Academy of Arts and Letters. Tues-Sat 9-4:30pm; Sun 1-4 pm. Free. 3 exhibits each year honoring American writers, artists and composers. American Numismatic Society. Tues-Sat 9-4:30pm; Sun 1-4 pm. Free. More than 600,000 coins and medals dating from pre-Caesar time. Hispanic Society. Free. Displays Spanish art - El Greco, Goya, and Velazquez. Plus the Children's Museum of Native American is reserved only for school groups.