The presumed tomb of Archimedes is an artificial cave carved into limestone, located within the Grotticelle necropolis, which in turn is situated in the northernmost part of the Neapolis archaeological park, located in the urban area of Syracuse. (Entry from the Italian Wikipedia page, CC BY-SA. Place marked by the OpenStreetMap community.)
In the app, check in on site: you earn a point and the AI guide tells you about the place in your language.