Films are an expression of histories of human, nature, society and culture. Films depict the ways human interact, behave with others, express their utmost feelings and uphold their very way of existence for a frame of time. A film can very well represent the time and situation of an era, a decade or even a century. Documentaries are very special type of films that are informational and formal in nature and different from the mainstream films. They’re structured and provide its viewers a specific knowledge. This article goes in depth of the documentary films in particular and searches the very difference that makes it unique among the other categories of films. Then it focuses on some of the documentaries made in Bangladesh. After that it goes on providing with prospects and suggestions to film documentaries in major locations, structures, monuments and other engineering marvels that Bangladesh boasts upon. The article gives an idea that some of the engineering projects on which documentary films could be made; that those are already built, those that are under construction and those that will be built in the future. In a target to achieve the vision of a digital Bangladesh; branding of Bangladesh can be done through these documentary films to the foreign investors, tourists, law and decision makers and state leaders alike.