New York has between one and two billion museums–all wonderful and interesting in their own way. They’re even that much more wonderful and to-die-for interesting when you can go for free–and many have certain days and times when it costs you nothing but a smile. Here’s a list of the whens and wheres of gratis museum hopping:

Museum of Modern Art:  Admission is free for all visitors on Friday evenings between 4 p.m. and 8 p.m.

Whitney Museum of American Art:  Pay what you wish on Fridays, 6-9 p.m.

The Frick Collection:  (European artists) Pay what you wish Sundays between 11 a.m. and 1 p.m.

The Jewish Museum:  (Jewish Art and culture) Free all day Saturday (11 a.m. – 5:45 p.m.)

Children’s Museum of Manhattan:  On the first Friday of every month admission is free from 5 – 8 p.m.

Studio Museum in Harlem:  (Artists of African descent) Free every Sunday (12-6 p.m.)

The Morgan Library Museum:  (Rare books and manuscripts, plus drawings and other uncommon pieces) Free Fridays from 7 p.m. to 9 p.m.

Museum of Jewish Heritage:  (A memorial to the Holocaust) Free admission every Wednesday from 4 p.m. to 8 p.m.

The New Museum:  (Contemporary art) Thursday evenings between 7 p.m. and 9 p.m.