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by jarek 3901 days ago
You can add just about anything on OSM (http://wiki.openstreetmap.org/wiki/Category:En_key_descripti...), so the only limit is what people actually map :)

(and sometimes what the community decides, e.g. adding things that can't be seen anymore, like old tram lines, is generally frowned upon in main OSM and requested for something like Open Historical Map instead)