When I first visited the University of Geneva in 2012, to speak at the centennial celebrations for the Rousseau Institute, I came early for some research and—when the archives were closed—decided to go find Piaget’s grave. That turned out to be a challenge, however, because it is unmarked except for a number. (I confirmed its identity by examining a numbered list that was kept, in a plastic folder, in the office.)
For those who wish to visit, the tree and stones are located in grid-square I3 in this map. The Cimetière des Rois itself is in central Geneva, immediately south of the heroin district. (Go during the day; navigate via Google Maps.)
A high resolution version of my photo is available from American Psychological Association—in the open—as online supplemental material. This, however, is a JPG. Contact me if you need a TIF for publication. (And please remind me that I kept a copy of it, with and without the inset, in my archived folder from the report of my visit.)