Inside of the Munger fort there is a natural rocky eminence called as Karnachaura associated with the Raja Karna. Buchanan mentioned that this king built a house on this hill. The ruins of which were occupied under the British by a saluting battery; but later General Goddard built the present bungalow on the site as the residence of the Commanding Officer, since it commands a fine view of the surrounding country.
An old platform in front of the Bungalow near the hill are also locally considered to be the work of the king Karna and his wife.