As somebody who photographs headstones when I have the opportunity, I have seen them pop up in the most unusual places during my research. Some are in the middle of roadways, like: https://www.indystar.com/story/news/2016/06/14/remains-seven-found-grave-middle-road/85866202/; I haven’t run across any of these personally, but there are examples that show up on cemetery groups on occasion. Others are in, or next to, a shopping mall parking lot: https://www.atlasobscura.com/articles/cemeteries-stranded-in-parking-lots; several are in or next to apartment complexes: https://www.findagrave.com/cemetery/2179723/turkey-creek-cemetery.
Some of my ancestors, https://www.findagrave.com/cemetery/2404149/memorial-search or https://billiongraves.com/cemetery/Stiglets-Family-Cemetery/171275, are buried next to a car dealership. Their graves were lost to time until the car dealership was expanding and found the graves in an area the dealership had planned on using. The car dealership family has become caretakers for the three (3) graves of Vincent Stiglets https://www.findagrave.com/memorial/70608423/vincent-stiglets, Felicita Stiglets https://www.findagrave.com/memorial/70608620/felicita-stiglets, and Usan Stiglets https://www.findagrave.com/memorial/70608545/usan-stiglets. I am related through Vincent and Felicita‘s daughter, Ellen Stiglets Richard (sometimes listed as Richards) https://www.findagrave.com/memorial/29575536/ellen-richard, who is buried in a different cemetery, Coalville Cemetery https://billiongraves.com/cemetery/Coalville-Cemetery/164407, that’s not too far away.
One of the most unusual locations for graves is next to an active runway, https://www.google.com/maps/place/32%C2%B007’43.7%22N+81%C2%B012’24.9%22Wemail@example.com,-81.2074535,148m/data=!3m2!1e3!4b1!4m13!1m6!3m5!1s0x88fba19c02671389:0x2dd0df77f896901e!2sSavannah%2FHilton+Head+International+Airport!8m2!3d32.1294267!4d-81.2018521!3m5!1s0x0:0x0!7e2!8m2!3d32.1288027!4d-81.2069047.
They are Catherine Dotson https://www.findagrave.com/memorial/157842805/catherine-dotson and her husband, Richard Dotson https://www.findagrave.com/memorial/157842687/richard-dotson. Here’s the BillionGraves link to the cemetery: https://billiongraves.com/cemetery/Dotson-Family-Cemetery/294083.