Garden of the Gods Park, Colorado Springs, CO

I wouldn't believe it if I didn't get out and scamper over the (approved) rocks myself. It's truly a wonder of ancient rocks, sands, pressure, and water. If you ever have the chance to go, I'd recommend it. But, I'd also recommend not just driving through - get out of the car and put your boots on the sandstone (where allowed of course). 

In case the fear of falling to your death wasn't enough incentive to keep you on the trail.  

Pike's Peak