Crag features

Fortress of Solitude is 250 feet high amphitheatre of rock with sickly steep walls in its central, south-facing cliff, with shorter outlying caves and walls on its flanks. The rocks varies from shattered to sublime. It is Colorado's biggest limestone sport crag and also happens to have Colorado's biggest sport-crag approach: 1 steep hour uphill, with some nasty scrambling thrown in as a bonus. 

It was looked at and dismissed by many climbers for years (Rifle was just too close by) until Tommy Caldwell, Mike Caldwell, Nick Sagar, and Herman Gollner found the key nature trail up to the crag and began bolting routes.