This article aims to investigate the fact of Rach Cat Fort, which is deemed the largest fort of the French in Indochina for the duration of the colony, as well as propose some specific suggestions for the tourism development benefited from Rach Cat Fort. The author employed quantitative and typical qualitative design methods, including observation, interview, data collection, textual analysis, and thematic analysis over the course of fieldtrip and fact-findings in order to clarify historical values of Rach Cat Fort and the factual situation in preservation and tourism potentials. The results unveil that Rach Cat Fort is undergoing a serious deterioration due to a lack of conservation and the poor exploitation of tourism. Meanwhile, this site has been long militarized, so tourism potentials do not have a chance to be exploited by the local authority. Thereby, the author proposes some key suggestions to get this historical site well-preserved and be in the development trajectory of local tourism.