Hikers walk amongst the unique U- shaped troughs of “The Wave” rock formation at the Coyotes Buttes North wilderness area near Page, Arizona on October 30, 2017. The Wave is a sandstone rock formation in northern Arizona and was formed by a combination of water and wind erosion and due to its fragile nature, access is limited to only 20 hikers per day. (Photo by Mark Ralston/AFP Photo)
