The architectural aspect of the Malhar Fort was significantly established from dynasty to dynasty. During the era of 200 CE a seal made of clay resembling the village of Kosala or "gamasa Kosaliya" was brought up. It was actually the name of the place that surrounds the place of Malhar. Also the legendary clay figure of 'Maharaja Mahendrasya' was located at the entrance of the Fort. It was inscribed in the alphabets of Gupta Brahmi. An attractive parapet consisting of two trenches are some of the astonishing features of the Malhar Fort.
The old fort of the Bilaspur, Ratanpur Fort is the highlight of the city. The history of the fortress is not yet accurate, therefore leaving the mystery of the construction shrouded. It is believed that there is no historical evidence or any kind of inscription which can erase the blur of the mysterious construction. There is no evidence which can demonstrate the real commissioner of the fort.