Good things to see on I-35 through the country?
So I am planning a trip from Austin, Texas where I live just on I-35. It will take me through Oklahoma city, Kansas city, Des Moines, and Minneapolis. I need to know of some interesting things that might be on that route, maybe a little ways off that route what we could possibly do. Even something that might be interesting to look at. So if anyone lives anywhere off I-35 or just knows of some places any input would be great. Thanks!