Aviana's Burial Circle is a circle of stones surrounding a raised bowl (one hesitates to say "bird bath"), and was the final resting place for Aviana in her incarnation of the War of the Ancients.
During the quest 
[30-35] An Offering for Aviana, the player brings a vial of Sacred Nectar to the circle and summons an image of Aviana.
Patch changes[]
Patch 4.0.3a (2010-11-23): Added.