This article defines GIS applications; it summarises their genesis and the history of their use; it describes their application especially in the humanities with an emphasis on historical disciplines. Examples of seminal HIS-GIS systems created abroad are given and scientific platforms where these outputs are presented are mentioned. It introduces in more detail the new Czech web map portal of the Historical Town Atlas of the Czech Republic created on the GIS principle in 2010. In connection with GIS issues, the author draws attention to a number of web map servers and web map portals available to the historian to utilise in his work. Old maps are often part of these portals. The process of digitalisation is closely linked with old maps in an internet environment and the author summarises this and describes various stages of the subsequent processes dealing with digitalised maps.