Shows the evolution of the natural landscape in Northwest Colorado over 40 to 100 years with the use of the repeat photography technique.

"The ribbon of dusty road on Rollins Pass has a timeless and beloved history. First known as Boulder Pass, this comparatively low saddle on the Continental Divide in Colorado has been in continuous use for millennia. First utilized as an expansive Native American game drive complex, the pass subsequently functioned as a toll wagon road in the 1860s. At the turn of the 20th century, Rollins Pass became the highest standard-gauge adhesion railroad grade...