For thirteen years, Bank of America has put together their Museums on Us program where account holders get access to art and cultural institutions all across the country. They add more museums, aquariums, and cultural sights each and ever year. This year, the program includes 150 institutions in 85 cities, which means you can get into more places for absolutely free (this includes Merrill Lynch customers, which Bank of America acquired in 2008).
The participating institutions include the whole spectrum, in terms of popularity, and most notably include the Metropolitan Museum of Art in New York, the Museum of Fine Arts in Boston, the Seattle Art Museum, the Art Institute of Chicago, the New York Aquarium. My current fair state of Maryland only boasts two participating institutions – The American Visionary Art Museum (I went to a wedding here recently and it’s a pretty cool and wacky museum!) and the Reginald F. Lewis Museum of Maryland African American History & Culture.
To find out what institutions are participating in your area, you can search the Museums on Us  site for more information.
Some fine print for you:
To qualify for Museums on Us, customers simply present their Bank of America or Merrill Lynch credit or debit card along with a photo ID to gain one free general admission to any participating institution. Not valid for special exhibitions, fundraising events or ticketed shows. Not to be combined with any other discounts or offers. Free admission does not guarantee reservation. Offer valid the first full weekend of each month through December 3-4, 2011