I loved the Corn Palace when I saw it as a kid. That one and Lucy the Elephant.

My family once went to Graceland when we were on a trip and were completely depressed from visiting pretty much every Civil War site between Texas and East Tennessee. I don't normally go for the likes of Graceland but it was a nice break. We didn't get to see Elvis' cars, though.

Central City, Colorado, used to be delightfully tacky when I was a kid but since then it's been converted to casinos and is just plain tacky.