I saw the sign for Petrified Forest National Park as I was shooting down I-40 in Arizona last month. I almost didn't stop, because I'd not heard of it before and it wasn't on my itinerary. But I was doing good for time, and the random drifting and exploration is what makes my road trips special, so I got off the highway and turned into the visitor center. What's a few minutes spent finding out what's here, eh?
It was one of the best decisions of my trip.
The north part of the park is a small loop that takes you out onto the edge of the Painted Desert.