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Abstract: The area of the North-West Bohemia (the Czech Republic) is a significant example of human impact on the environment. Intensive open-cast mining, heavy and chemical industry and huge dam structures are irreversibly changing the shape and function of the surrounding landscape. All the information about the above described phenomena is contained in many historical sources (old maps, aerial imagery, and so on). Within our project we work on bringing all this information together in a unified information system. In this paper, significant examples of how historical data may be processed and offered for use by other scientists or the wider public are described. Different types of visualization and analysis are performed using the processed data. Here we may encounter digital terrain model reconstructions and analysis, land-use and town/village center reconstructions and vanished building identifications. All the processed data (so far) are accessible to the public in two different methods – as an interactive web mapping application, and the ArcGIS Server Rest Layers.