Royal Gorge-Colorado, incline railway.

Built in 1931, and traveling at a 45-degree angle, the world's steepest Incline Railway is still considered one of the most difficult structures ever built. Here, timeless granite walls loom all around as you descend over 1,500 feet to the canyon floor, a mere 50 feet at its widest. Looking up, the Bridge appears as a delicate ribbon cutting across the sky.