StoneRing
The StoneRing of the druids is an ancient site, predating the city by an unknown, but assumedly vast, number of years. While far from unique in the Flanaess--such rings from a central feature of the druidic faith--the Greyhawk circle is among the oldest yet discovered.
The tops of the stone columns are worn smooth, the edges rounded by wind and rain. This is not a scene of regular worship, but druids often stop for a moment of prayer as they pass.
A character standing among the central stones of the arch can speak, act, and think without being observed by any magical means (a crystal ball or spells, such as clairvoyance, ESP, or clairaudience).