HellMap
I guess this is weird because these aren't 2 buildings, these are 2 parts of 1 building, specifically the support pillars of the lock. Usually, building ruins are basically the outline of the building.

Anyway, I added `building=ruins` then. Wiki says this isn't quite right but it's used like 150K times on taginfo, so I think that's what it is in practice. Does this look good? Renderers should probably be happy now. I guess default rendering doesn't render any historic stuff.

I don't know if some other man made or something tag is useful here, feel free to add whatever sounds right.