Stonehenge was also a type of
BBS system popular in the late 80's and early 90's. It was primarily based on the
WildCat software, written in Pascal. This version of the software was mostly used in and around Seattle, with a particular variation being
Stonehenge Citadel. It ran on IBM based machines, but I believe there was a port for Mac.
This was a room based system that allowed users to navigate to message spaces, and thereby post. Of course, most if not all of the boards had hidden file areas, and some had FidoNet relay for a simple sync with other stonehenge boards.