From an article from Speaking tree,
Baliya, Uttar Pradesh is no common place; it is attached to the history of the most feared god, the lord of destruction, the creator, the mystical Lord Shiva. This place is called kameshwar dham, a place that has been mentioned in shivpuran. This is the place where lord shiva opened his third eye.
It is said that when lord shiva was in a state of trance, Lord Kamdev interrupted Lord shiva exactly at this place, hiding behind a tree. There is an interesting story about how all this happened. everybody knows lord shiva was married to sati, sati’s father disrespected lord shiva during a yagna and this led to a tragic incident which left lord shiva stunned along with everyone. Sati, gave up her life because she could not listen to anything against lord shiva by jumping into the fire that was lit for yagna. this made lord shiva so angry that he loses all his senses and wanted to destroy the whole earth. He even did the most feared power ‘tandava’ where he danced and the whole earth went haywire!
Lord shiva’s tandava could destroy the whole universe so the other gods decided to calm him down and after a lot of efforts lord shiva takes up the trance phase and goes for meditation to calm him.
Meanwhile, a demon called ‘tarkasur’ praises lord brahma who is known as the creator of the universe and gets a boon in return. The boon was that he could be only killed by shiva’s son. As sati was no more, tarkasur knew he is immortal now. Tarkasur went on to take over ‘swarg’ and wanted to rule the heaven. Every god in the heaven knew what was about to happen. So they decided to send, Lord kamdev as a messenger to disrupt lord shiva’s meditation.
Lord kamdev then goes to lord shiva, in baliya where he was in trance phase. He hid behind a mango tree and tries to disturb lord shiva by throwing a flower rosette (Pushp Baan). It hit Lord shiva’s chest and his trance phase was disturbed. Lord shiva then gets angry and burns Lord kamdev to ashes by opening his third eye.
The mango tree, which is said to be the same tree as the tree where lord kamdev was hiding still has some burnt areas and still exists. it is also a belief that in tretayuga, Vishwamitra, Rama, and Laxman also visited this place. This place is supposed to be sacred as a lot of rishis have come here and meditated.