There are dozens of climbing routes on the famous Flatirons in Boulder. Until recently, all of the routes on those monumental rock formations were installed, or mapped out, by men. That changed recently when two female climbers collaborated to install a new route on a section of the Flatirons known as The Maiden formation. 

Lynn Hill and Sasha DiGiulian are at very different points in their climbing careers, but they came together to create this unprecedented route.

The route, and why it matters to the climbing community, is also explored in a new documentary called Here to Climb, focused on DiGiulian's developing career.

DiGiulian began her career in climbing gyms when she was six and quickly began winning many competitions at a young age. Lynn is a veteran climber, who became famous as the first person – male or female – to scale an area on Yosemite's El Capitan called The Nose, unassisted.