This is the Parker, Colorado, Reuter-Hess Incline. With "only" 132 steps it is not a big challenge for me but it has great views at the top. Most people do multiple rounds. Great activity on a sunny day.
This section of the Colorado Trail is outside Copper Mountain Ski Area. I don't plan to ever walk the entire Trail from Mexico to Canada but I walked in a mile and came back to the same spot to say I walked some of it!