If you’ve flying somewhere this weekend and have a free afternoon, check your wallet. There may be free dinosaurs or art treasures in there.

If you’re a Bank of America or Merrill Lynch credit or debit card holder, you’re eligible for a free admission at more than 150 museums around the country – a perk that returns on the first weekend each month as part of the long running Museums on Us program.

If you’re near Dallas, for example, you’ll get free entry at the Perot Museum of Nature and Science , where general admission is $15.

As I learned during an all-too-short visit this week, the museum has five floors filled with 11 interactive permanent exhibits offering everything from dazzling gems and minerals to a bird hall, a dinosaur-filled then and now exhibit and the opportunity to learn about and explore sport, science and space.