The mosque is considered to be the house of God for the Spiritual activities of Muslims all over the world. Muslim rules were established in Bengal at the beginning of the thirteenth century. The journey of the architectural style of mosques in Bangladesh started during the independent sultanate period. Considering the order and time of the establishment of mosques in Bangladesh, the Sultanate period, Mughal period and Modern period mosques (contemporary trends) can be seen. At the beginning of the Mughal period, there was a transition period after the sultanate period. At the end of the Mughal period, the journey of the British Colonial period started and after 2000 AD can be considered as a completely Contemporary modern period. The scenario of mosque architecture in Bangladesh has been developed through a lot of evolution and transformation, from the Sultanate period, Mughal period, Transitional period, Colonial period to Modern Era (contemporary trends). The main purpose of this research paper is to discuss the overall and evolutionary concept of the history of mosques and creating a timeline for the construction in respect of Bangladesh. This timeline will include the name of different types of mosque architecture, period of construction, location, still image, distribution according to different times etc. On the basis of this information, a comprehensive idea of the architectural features of the mosque architecture can be found in the form of graphics that will enrich our timeline. A chronological method from the literature review is created to figure out each stage of culture, religion and evolution of the Mosque. The more versatile talents that will be revealed in the research paper will include the combination of time and transition. Comparisons between the previous mosque architecture and the subsequent or, next to mosque architecture, architectural comparisons and the effect of time change etc. can be seen. Through this paper, therefore, the mosque Architecture of Bangladesh has been divided into six times or periods. Here's an example of a mosque with the deployment of identity that has been drawn to include more over time the identity of mosque architecture, features and graphical analysis.

Mosques, Tombs and Shrines of famous religious people are one of the examples of South Asian Islamic Architectural Landmarks. Saints or famous preachers of ancient times were generally buried near mosques after their death. Due to the prejudice and religious beliefs of local folks these tombs were preserved in a decorative fashion after the death of these saints or religious men. Thus, these tombs are carrying historical importance as archeological establishments for decades. For restoration work, it is very important to know and follow the proper preservation or restoration rules. There are many heritages are now facing a lot of identical crisis because of improper restoration work especially in Bangladesh. Tomb of Baba Sales and His mosque are facing similar difficulties which have already lost its historic values. This historical monument is situated in Narayanganj region of Bangladesh. For lacking proper preservation and conservation of this historical architecture is losing its uniqueness and its own historic identity. Previously there was an attempt to restore the structure of the tomb. However, that attempt failed because of not maintaining a proper procedure of restoration. As a result, it led to a different set of problem. This paper illustrates the documentation, Photography, and Restoration this old and historic building and preserved to its previous glory. This paper also deals with the different set of problems, solutions, and maintenances for preserving this monument which is standing for decades with its own historical rights.

Abstract- In the medieval period, A lot of Muslim establishments have been established in Bengal. Basically, After the Muslim conquest in the late 12th century and the beginning of the 13th century, Muslims built various structures in this Bengal. These installations include mosques, tombs, khankahs, palaces, forts, bridges, arcade gates, shrine and defense walls. All these establishments made a strong and effective contribution to the Muslim urbanization, and propaganda at that time. Some of these historic installations have been lost forever in the turbulent eclipse. Some of them are in a state of fragile and slimy conditions. Although these structures can be protected from natural barriers, some installations are destroyed by human hands. People do not know the value of nature, as a result nature behaves in a hostile way with their rebellion!!! Likewise, an important and beautiful Spectacular is the “Kadam Rosul Dargah”. Apart from the time spent by natural weather and humid weather, the settlement of these structures remains unchanged, but it does not survive from the minds of the different minds. Due to the mind-mentality of the people, the lack of desire and the expansion of the view, there has been a lot of change in the dargah deployment. Over time, the establishment of this dargah is very threatening today.Although this establishment has not yet been abandoned. Before explaining the problems, solving the solution and passing the path, the details of this deployment are required.In the expanded documentation,this religious and historical values of this establishment will emerge, as well as the original design, the functional changes will all come together over time. And it will come out with the necessary problems and the way to overcome. The Kadam Rosul dargah is a unique establishment that has formed the bridge between the Sultanate, Mughal and Colonial period. It's important to keep this installation alive for the future. All of us have to do these things, in the interest of the country, for the sake of saving our heritage, for the sake of the people. If we cannot preserve our own history, heritage and culture for the coming days, what will we leave to the next generation? Can we introduce them to the story of the prehistoric mythology?

The heritage of Bangladesh is surviving with its own identity and existence. Buildings may sustain damage due to numerous basic reasons. In renovation work it is necessary to find out the damages and repair it with best techniques. Narayanganj is one of the most important historic city in Bangladesh. It was the important administrative region in the medieval period and established lots of buildings like mosque, tombs, garden houses, temples, guest houses, the fort and kadam Rosul Shirni. In Narayanganj, now a numbers of sultanate and Mughal establishments are the witness of time period. Although lots of local development have been done due to demand and lost its own identity. With the help of governmental organization, or any international organization like ICOMOS, UNESCO, it is possible to save the heritage and the original character of Mughal establishments and turn into them most attractive tourists and archeological spot in Bangladesh. This paper deals with the architectural features which focus on construction and possible techniques used for renovation or reconstruction work of Bandar Shahi mosque and what could be the best solution, the possibilities to save the heritage and monuments for the next generation.