Medicine wheels are found all over northern United States and southern Canada, but the most famous medicine wheel is located at the summit of Medicine Mountain in Bighorn National Forest, in the U.S. state of Wyoming. The Bighorn Medicine Wheel was the first such structure to be associated with the term “medicine wheel”.
Other medicine wheels have existed for a long, long time. Some of the oldest medicine wheels are 4,500 years old. There are evidences that these wheels were built up by successive generations who would add new features to them. This has lead archeologists to suspect that the function and meaning of the medicine wheel had changed over time, and it is doubtful that we will ever know what the original purpose was.