The research aims to study, document and record heritage buildings. It is considered a step to preserve the heritage environments for their durability by introducing a 3D interactive models that include all data and details of the building. This can be achieved by using computer software to produce the virtual heritage to present the architectural heritage with the lowest possible costs, in addition to the following goals: Documentation the historical building as an initial step in the process of preserving the building and its durability. Moreover, Developing the search base and the historical analysis of the building. The research studies the modern methods of architectural documentation of the historical sites in Alexandria; (Citadel of Qaitbay) as a case study, which uses modern, simple and low-cost techniques. The documentation process exceeds preservation to provide all the building's online information to serve researchers, architects and visitors.