Virupaksha

The famous saint Virupaksha lived in a cave on the South slope of Arunachala. The cave is said to be in the shape of OM and some people report to have even heard the sound of OM whilst meditating. The saint's tomb is there and bears his name. Ramana Maharshi lived in Virupaksha Cave before moving to Skandashram cave a little further up the Hill.