There are 3 museums. Route 66, so much to see and video movies, 1.5 hours, NASA museum upstairs, 1.5 hours and RR museum 1.5 hours. You don't have to do them on the same trip!!
It doesn't take long they don't really have anything there. Some pictures on the wall. There is a railroad museum and 66 museum all in the same building plan 2-3 hours for all.
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