This is a Jeevasamadhi of Elumichai Ramaswamy Siddhar.
There is a place to sit and meditate. You can go into meditative states here effortlessly.
How to get there
It is located 24.5 kms East of Virudhachalam.
Map: https://goo.gl/maps/ZoFfUaR6KLc81PxX7