[Tagging] artificial cave, historic military shelter

Martin Koppenhoefer dieterdreist at gmail.com
Sun Sep 4 10:09:43 UTC 2016

sent from a phone

> Il giorno 04 set 2016, alle ore 11:40, Richard <ricoz.osm at gmail.com> ha scritto:
> Also, I would 
> argue that "natural" implies natural

ok, agreed

> and there have been enough informal 
> proposals for man_made=shaft and similar.

I think a shaft is pretty different from those grottoes I mentioned, in being a vertical, regular structure and normally longer, while the artificial, decorative/recreational grottoes are not very deep. Also the former is usually of technical character, while the latter is decorative.

maybe man_made=grotto for these cases?


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