The specialty of this Shiva temple is that offerings of ghee turns to butter when applied on the Shiva Lingam (idol). The same butter is served as prasadam to the devotees. This temple was patronised by Kempe Gowda, the founder and architect of Bangalore. And you can find the bronze statue of Kempe Gowda along with ancient idols of Fire God, Sun, Dancing Ganapati etc,. inside this cave like temple. There is also a tunnel inside the temple which is said to connect to the heart of Bangalore.
