This research examines the architectural heritage of Kaptol and Gradec in the period from the 13th to the 15th century. The paper aims to review and digitize literature concerning the medieval architectural heritage of the area to encourage a better conservation presentation and the wider digitization of Zagreb's history. Data on the lost or preserved medieval architectural heritage was collected through literature review and in situ analysis. Existing data on individual buildings were entered into the GIS program from which the thematic maps were created. Five different thematic maps of Kaptol and Gradec were made, including a map of the medieval walls. Sites with preserved medieval architectural parts were divided into categories, depending on the degree of their preservation and the percentage of preserved original medieval material. There are fourteen sites from the medieval period in this area that have the status of cultural heritage. Ten archeological excavations have been established on Kaptol and Gradec, which have revealed medieval finds. Eleven demolished or unlocated buildings were detected and reference was made to the literature useful for their further research. A catalog form has been made for fourteen buildings that have survived to a greater or lesser extent from the Middle Ages to the present day. The thesis also looked into the possibilities of digital presentation of heritage, referring to similar projects in Dubrovnik and Venice. A proposal for a more complete presentation of the medieval architectural heritage of Kaptol and Gradec was also made, referring to the floor presentation of the former city gates and the maintenance of the already presented sites.