The purpose of this paper is to present the methods and tools used to adapt the outdated website of Old Maps, Engravings, and Photographs from the City Museum of Belgrade, built in the mid-1990s, to the modern web technologies. The Mathematical Institute of the Serbian Academy of Sciences and Arts initiated this projectin 2019 and the upgrade was finished in March 2020. The adapted website is publicly available to visitors on the sub-domain of the Mathematical Institute.