Well is there anything still there? Some places still have their city walls, which are still physical walls (albeit not used as such), hence the `barrier=city_wall`. `historic=citywall` is a good tag to add as well (not: `historic` not `historics`). If the structure has been completely removed, then there is no more wall/barrier there any more, and it should be removed from OSM.OSM. **Update after edit**: > A part is still intact, for those the tags make sense, I agree. Other parts are completely gone. Should the historic be kept? On other parts, there is a special pavement indicating that there was a wall in ancient times. What about those? If there is no physical wall there, then the `barrier=city_wall` should be removed. Because there is no longer any barrier there. If there are/is a monunment to the old wall, you can map that. Otherwise, if the object isn't there, delete it.

Well is there anything still there? Some places still have their city walls, which are still physical walls (albeit not used as such), hence the `barrier=city_wall`. `historic=citywall` is a good tag to add as well (not: `historic` not `historics`). If the structure has been completely removed, then there is no more wall/barrier there any more, and it should be removed from OSM.