There are many stunning geological features in the badland areas of Montana, South and North Dakota. One that nobody should miss while visiting the North Unit of Theodore Roosevelt National Park is Cannonball Concretions.
Here is my tip: If you visit the National Park, go to the Cannonball Concretions pull-out any time during the day. Explore the area, read and learn about the cannonball concretions on educational displays, take your selfie pictures or try to find a critter, and just have fun being there. However, come back for your serious photography of these fascinating geological features about an hour before sunset, when the slope and concretions reveal their colors and shades become almost horizontal.
You’ll find endless photo opportunities and even after several visits you probably discover shapes and structures you may have missed before. It is quiet, it is peaceful, and if you are able to disconnect for a moment from the rush of the modern world , you may start to understand why places like this had always a special meaning for Native people, long before the land was taken away from them.