Castle Rock in Boulder Canyon. Once home to the hardest climbs in the country and where Colorado hardmen go to train for Yosemite because the granite is similar. Picture a four pitch beehive that sticks straight out of the road in the middle of the canyon. Just a weird formation that we don't have on the EC. And man is the climbing tough, I popped my shoulder out in an off-width on pitch three of the easiest climb there -- West Face Direct.
Here ISBD is featured on the 5.4 downclimb.
Weird route, weird place, definitely a thrill.