Just about a year ago, we took two of my children and their families on a three day trip. Our first stop was in Waco, Texas at the Mammoth Museum. Rather than being only a museum about mammoths, the sight was actually on the spot where the bones of mammoths had been and still were being dug up.
For years we lived just an hour and a half from this museum, but had no idea of how fascinating it was. It is also possible to help out with a dig, if you are interested.
I would highly recommend visiting this museum if you are ever in the area.