Temple of Diancecht

In a 2003 campaign, this temple was overrun by a snake-worshiping cult. And purged, perhaps permanently, by the party. 

Diancecht is a god of druidic healing magic, and this temple is just outside Stonebridge near Cormire. Other temples to Diancecht may exist, including at least one in Cormire.

From 2003 campaign notes (snake-invaders redacted):

Passing through the tiny village and away from the lake, the group will soon see a small temple in the woods. Oak trees ring the temple, and mistletoe hangs from its branches. The temple is a squarish stone structure, with broad steps leading up to the huge wooden doors which are almost always open. Within, a large chamber with two rows of columns leads up to a raised dais. On the dais, a bronze statue of a young man hold an oak branch in one hand and a sprig of mistletoe in the other. Walls are all decorated with bas-relief depictions of a young man healing the sick and injured, curing the blind and diseased, and raising slain children from the dead.

A single door is behind the dais. The torchlit inner chamber is clearly a place of holiness for the temple priests - statuettes, papers, mirrors.