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Architectural survey is an evolving field in architecture that has been affected during the past decade by the technological advancements in the field of 3D data acquisition. Some of these technological advancements include long-range laser scanning and photogrammetry. Laser scanning gives us an accurate documentation of the site, even in cases where parts of the building have collapsed. This paper aims to present two case studies of digital documentation through laser scanning and photogrammetry that led to the structural reinforcement and preservation of the first site and to a digital reconstruction and a mixed reality platform for the second site. The first site is an Ottoman Soap factory in Lod, Israel and the second one is an Ottoman Bathhouse in Apollonia, Greece. Both sites dealt with challenges during documentation due to a partial collapse of the building or due to dangerous structural conditions. The digital documentation methodologies allowed for a fast, accurate and comprehensive survey, as well as for a good understanding of the building and the areas which were concealed as a result of the collapse. At the same time, the digital documentation model gave the potential for the cultural heritage (CH) site to become part of the social, economic and cultural local community. [ABSTRACT FROM AUTHOR]