The whole area is an old mining area and there is plenty of evidence of this. The trails bring you by multiple old foundations and some more intact buildings.
If you know where to look you will find a place very popular to rock climbers, they call it the library.
Here is a video trip report I did September 2013. In the video I stick to the trails and show off some of the on trail views. I also discuss some hammock gear I happened to bring along to setup for a lunch break.