What is there to see in the midwest

[Catherine Keegan]

We got our packet so we will officially be selling at the Pennsic Wars this 
August.  Now, it's a long way from California to Pennsylvania and there 
must be some interesting stops along I-80.  Please tell me there are...

We made the drive a few years ago and all I can remember is Kansas...miles 
and miles of Kansas corn fields.

We'll probably drive directly there but we'd like to stop and see some fun 
things on the way back.

Clues appreciated!   Yes, I know it seems early but time moves a lot faster 
these days than it did a few years ago.  Another thing my mom was right 
about...

Catherine in California