Neat link! I've been to about three of them (Utah, Arizona ones). I was not impressed with the petrified forest, I'm kind of surprised it made the list. Compared to some of the other things on the list, I thought that one was least interesting. But the ribbon one in Arizona -- I have been close, but not to that exact destination. You see a lot of things like that near that area though, it's simply gorgeous and amazing. When we lived in NM and AZ, one of our favorite vacation spots (and one of my favorite places on Earth) was
Lake Powell. we always went up through the Page, Arizona side (closer to us).
I'm surprised the ever famous
House on the Rock wasn't on the list (I checked out this link- they've added a lot and made it much more "touristy" since my visit in 1993). It's certainly an oddity!