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Dozens of objects that have cultural, technical or historical value are destroyed in the world every day. Sometimes these are small monuments of various origins, standing in seclusion. Yet they disappear irrevocably, and often there is even no mention of them. The reasons are the expansion of civilization, lack of interest, poverty, terrorism, wars, religious conflicts, vandalism and other unfortunate phenomena of human civilisation. This contribution deals with an example of the gradual collapse of technical monuments; these monuments or objects are highly cited and mentioned based on changes in technology and the development of civilization. Old production facilities, factories, railway stations, including architectural features, were on the verge of protection. Only recently did talks about industrial monuments begin. But this is especially true in developed and rich countries. Developing countries have not yet reached the possibility of maintaining these monuments without the help of sponsors. In one case project we will show a very interesting object in the Cape Verde Islands. It is an old facility for salt extraction. It is located in a partially flooded volcano on Sal Island. During its history, slaves were used for a long time. A cable car was installed on site to transport the salt to the port. There was also the first diesel aggregate in West Africa. Currently, the area is only used as a tourist attraction (salt baths). In this case, the basic documentation and search for archives can help to understand its history, which can be interesting for tourists, who only briefly visited the salt baths in the former volcano. Documentation and technological description for the creation of the 3D model such as those with other local objects the like small church in the neighbourhood of this industrial monument is the main part of this contribution. [ABSTRACT FROM AUTHOR]