Set up a field trip for your class. They do have guided tours for groups. Also there are some training aids (question forms) which can be carried by the students, (sort of like a treasure hunt) ... The group I work with are special needs, high school students, (so its not so much of how much you saw, but you trying to find the material, and take a few motes for discussion when we get back to the class room.) and having fun!
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