500 climbers were asked to name the most classic boulder problems in North America.
This is a countdown of that result - the top 20.
This all female cast of athletes features some of the sports strongest and up-and-coming climbers in the world today.
Each problem showcases a different athlete such
as Ally Dorey, Cerre Francis, Kate Reese,
Charlotte Jouett, and many others.
Locations include Squamish, Hueco, Bishop, Ibex, Rocktown, Horespens 40, Gunks, Priests Draw and many more.

Release Date: 2007
Running Time: 60 Minutes