The historical site of Bhawanipur, also known as Devidamar, is located 4 km South of Mahendra Highway at Devdaha Municipality Ward No. 4. It is believed to have been ancient Devdaha, capital of the Koliya. The site consists of a temple dedicated to the Queen Mayadevi and other archaeological sites. Significants religious and archaeological and objects here include a long stone column(some consider it to be an Ashoka Pillar), stone image of Sun God, ancient brick well etc. Structural wall of ancient constructions are visible even at the surface level here.