The museum itself hosts everything from Dorothy II of the movie "Twister" fame to original Superman and Batman costumes. I was surprised to find Dorothy there as previous to this trip I thought the Wakita OK museum was the only place to see her. The mines are also used for storage and Kansas public records such as birth, marriage and death certificates are kept there.
Of course everyone wants to take some salt home and there is always a small pile available and they even provide the bags!
Plan to spend a couple hours on the tour; after you take the tram ride you can wander around and see old mining equipment on display and view the history of a salt mine that was formed about 250 MILLION years ago. The gift shop has among other things, a selection of t-shirts and salt lamps.
The general admission rates are $8.50 for children and $13.50 for over 13 to adult, making this an affordable family trip.