The smaller prehistoric site is being called "Bluehenge" because of the color of the stones that were placed there thousands of years ago but have since disappeared. All that is left are the holes made when the stones were put in place.
An artist's impression of the stone circle as it would have looked in prehistoric times was released Tuesday.
Researchers believe the newly discovered stone circle and the larger Stonehenge circle may mark a "domain of the dead" that was linked to the "domain of the living" by the River Avon.
Experts say the stones were incorporated into the circle in about 2,500 B.C.