The mini Grand Canyon has become a popular destination recently. The area is actually a historic railroad legend, called Horseshoe Curve. Elk Creek which navigates the valley was the track bed for the Elk Creek Branch of the Black Hills and Ft. Pierre railroad.
Found at this location also, is the Knife Blade Rock. The railroad used this and other rock outcrops in the area to help signal distance along the track.
DECIMAL DEGREE: 44.281091, -103.493820