Tonight I organized a brief tutorial on contributing to OpenStreetMap at my dorm. My dormmates raised some good questions that I didn’t have the answers to off the top of my head. One of the questions was whether there was a way to tag historical features that are now gone. Besides railroad rights-of-way and the
old_name key, I couldn’t think of a general way to map features that are entirely gone. I also fielded the standard questions about vandalism.