This is a loop route that is unique because it starts and ends on a summit, that of Mount Lemmon in the Coronado National Forest in Arizona. The summit sits at 9,167 feet in the Santa Catalina Mountains of southern Arizona, just northeast of Tucson. The drive just to get to the start/end point is spectacular, winding up mountain roads with switchback turns for over twenty miles. The route starts and ends just at the trailhead which is marked by a sign with an area map (see images), which is just off the parking area.

The Cathedral Traverse is iconic, it is also the business end of the Grand Traverse. It traverses Teewinot, Mt. Owen and the Grand Teton via its North Ridge. It is a serious undertaking and should not be taken lightly. 
https://www.mountainproject.com/route/120988408/cathedral-traverse