The two storey solid wooden building housing the museum today was built in the year 1897 as a fort by the second White Rajah, Charles Brooke to impose peace and order in the region where warfare among the local tribes prevailed.
The story begins with a Mr. C.C. (Claude Champion) de Crespigny, then the Resident of Baram, who was the first to record the presence of oil in Sarawak. The entry in his diary, dated 31st July 1882, refers to oil discovered in some 18 wells dug by hand by the local inhabitants.