An important place either during Army regime or after the unification campaign; Butwal has been frequently referred as Binayakpur, Lalitpur or Buddhaballi in the pages of history. Raanga Mahal built by King Mukunda Sen I, is equally important and valuable from social, administrative as well as architectural points of view. Inscriptions present in the nearby ancient Shivalaya reads that Mukunda Sen ruled the area during 1460 B.S. whereas Gandharva Sen ruled in 1769 B. S. Since there is no trace of kings like Manikya Sen, Phiroj Sen, Prithvi Senadhi, who ruled before Gandharva Sen, in the inscription, it is strongly believed that King Mukunda Sen, known for his strength and bravery, constructed Raanga Mahal. His ruling period started in 1575 B. S. and lasted till 1610 B.S. this fact concludes that the mahal was erected around five centuries ago.
Raanga Mahal is situated in Phulbari which is in the west of Butwal bazaar and in the north of east-west highway. The mahal is spread in the north –south direction and forestry department has planted trees around it. In the present scenario, Butwal municipality has built a park in the site so the mahal is now, located in the center of a dense forest. Thus the site has also been a popular tourist destination. The mahal is constructed using old bricks, stones and woods. The wall in the northern side of the mahal has two windows with small holes (khopas): only one of them can be opened. Rooms of the mahal are usually huge so they probably are living rooms. As the mahal is shilkalil based, documents issued during Udhauli and Ubhauli had Butwal, Binayakpur and Lalitpur written at the bottom of them. The name Raanga Mahal is so named due to its royal locality, administrative center and entertainment aspects. 3.04 meters high khandas are present in the northern side of the mahal. Though the plants and trees are trimmed often, they soon will grow into a dense forest. The area lacks an information board depicting the importance of the place. The municipality has built a park around the place so as to preserve, protect, and develop the area as a tourist destination. There is huge flow of people visiting the mahal for recreational purposes like picnics, marriage and the like.