Planning a corny road trip?

My boyfriend and I want to do a road trip in the US and see random, corny landmarks. For example, we intend to hit up the largest ball of twine in existence in Minnesota. Why? Well, we like to do stuff like this.

Problem being, if you look up random, corny landmarks on the internet, you don't get good results.

Any other fun/stupid landmarks out West to take a look at? We're starting in Philadelphia and intend to head westward, although I don't think he'd object to going South.
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Salon Springfield IL