The Doll's Head Trail has an Adventure Lab courtesy of the Georgia Geocachers Association. Upon completion of this Adventure Lab, you will recieve the coordinates to the bonus cache.
If you are not familure with the Doll's Head Trail, it is a short section of the trails at Constitution Lakes Nature Preserve that has been made into an art exhibit. It is rather facinating and well worth the hike.
Once at the listed coordinates, you can open the Adventure Lab app on your phone and select the "Doll's Head Trail @ Constitution Lakes" or scan the following code.
This cache is proudly in conjunction with a GGA Adventure Lab.