Alley Pond Environmental Center free admission; charge for some programs 
American Folk Art, Museum of free admission and programs for families and schools  
American Illustration, Museum of free admission and tours, including groups  
Bronx Zoo free admission on Wednesdays  
Brooklyn Botanical Garden free entrance to grounds; fee for parking & programs  
Butler Preserve free admission  
Castle Gallery free admission, tours & programs, incl. groups  
Clay Pit Ponds Preserve free admission & programs, incl. groups  
Ellis Island Museum of Immigration free admission & tour, fee for ferry  
Eugene & Agnes Meyer Preserve free admission  
Green Chimneys free admission; fee for programs  
Harbor Defense Museum free admission  
International Ladies Garment Workers Union free tour for groups only  
Jamaica Bay Wildlife Refuge free admission  
John F. Kennedy International Airport free tour for groups only  
Judaica Museum free admission; fee for group tours & school programs  
Katonah Museum of Art free admission; fee for programs  
Lenoir Preserve free admission; fee for programs  
L.I. Wildlife Refuge Complex free admission to Wertheim & Morton Refuges  
Lower East Side Tenement Museum free admission to exhibit; fee for tours & programs  
Marine Nature Study Area free admission & school tours; fee for some programs  
Marshlands Conservancy free admission; fee for programs  
Muscoot Farm Complex free admission, incl. groups  
Muttontown Preserve free admission; fee for programs  
National Museum of the American Indian free admission, incl. groups  
New Windsor Cantonment free admission & tour, incl. groups  
NYS Unified Court System Tours free tours for groups only  
New York Stock Exchange free tour, incl. groups  
Philipse Manor Hall free tour, incl. groups  
Polish American Museum free admission  
Rye Nature Center free admission; fee for programs  
Statue of Liberty free admission, incl. groups; fee for ferry  
Teatown Lake Reservation free admission to trails; fee for programs  
Trailside Nature Museum -- Pound Ridge free admission & some programs; parking fee  
United States Military Academy free admission to grounds; fee for Museum  
United States Postal Service free tour for groups  
Walt Whitman Birthplace free admission; fee for programs  
Washington's Headquarters free admission & programs