The Boston Museum of Science is a great place to visit whether you're young or just young at heart. They have a really interesting set of exhibits, and there will surely be something to grab your attention--they have exhibits on biology and animals, as well as physics--including a huge Van der Graff generator that makes indoor lightning! They also get some really cool travelling exhibits that come through their galleries from time to time. Another highlight is the Omni theater--a very unique experience, very different from the more popular IMAX.
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