Signed Copy. The Colorado National Monument is a hidden gem at the edge of the Colorado Plateau on the Western Slope of the Rocky Mountains in Colorado. Known for its deep Monument Canyon with its steep cliffs and towering monoliths, Colorado National Monument — less than a two hour drive from Moab, Arches, Canyonlands — features non-stop, awe-inspiring viewpoints along its scenic 23-mile Rim Rock Road. The park also features miles of hiking trails, including deep into Monument Canyon. Plus... Colorado National Monument is one of the best places to see Bighorn Sheep! Explore this geologic gem of a park in Colorado National Monument!