Obviously this is much more amazing in person, but when I lived in CO, a friend and I went out towards Victor and saw all these wonderful abandoned mines. It helps that it was cloudy and mysterious outside.
This thing was huge, but my favorite part of the whole landscape was this gigantic wall of logs that covered the side of a cliff. There was also a big silhouette of Santa that lit up (or used to). It was just great to see things like that silhouetted against a big gray sky. Sigh.