A trail that picks up just south of Boulder and finishes at Ringing Rocks in Pipestone. It's a full day trip with a lot of fun driving, great scenery, mines to explore and lots of side trails. I went solo and there were definitely a couple of tough spots. A spotter would have been good to have as I narrowly avoided crushing my driver side front door...
Ringing Rocks is a unique place...a geologic phenomenon that apparently only occurs in a few places in the world. It is basically a huge pile of boulders and when hit with a hammer, sounds like a bell. Literally. Really cool place and a cool drive.