This is a very unique place to spend a Saturday, or any day for that matter.
Located in Bonner Springs, KS, the Agricultural Hall of Fame represents the evolution of farming. You can take tours and see how farming has changed over the years.
This is a great place to take kids and show them the various tools and lifestyle of farmers from different eras in time.
The do charge a nominal admission fee to enter, I think its $7 for adults and $3 for children, but you might want to check and make sure.
Note that I don't believe that they are open in the winter months.