Skyline Drive
I know what you're thinking, and yes, those ARE dinosaur tracks I'm standing next to. They're located along the Skyline Drive in Canon City (near the Royal Gorge), and if it wasn't for a small plaque along the way, you wouldn't even notice they're there. Definitely stop and get your Land Before Time on. Also, do it anyway for the Skyline Drive, which is pretty incredible.
5 countries - 39 spots