I have been naming these according to the "Missouri state highways" wiki, osm.wiki/Missouri_state_highways . I have sought clarification from the authors of that wiki page on this issue.

One day, San Andreas and New Madrid will go off at the same time, and this *will* be downstream of California. Go to the Santa Monica pier, put on your roller skates, and coast downhill all the way to St. Louis! :)

When I map a conservation area, I usually have at least a few changesets. For the first one or two, I'll spell out the full name, like Acme Conservation Area, but after that, I just put Acme CA.

I'm not actually sure how to tag this. It's man-made, not a naturally occurring feature. It started out as a limestone mine, but it isn't used that way any longer - the company that owns it rents space in it to other businesses, for storage and manufacturing operations.

At one point, all of the mined-out space was interconnected, but the owners have built walls linking the remaining limestone pillars. You could say it's a series of separate "buildings" now... or you could say it's one big "building" with several large rooms in it. It is possible to drive a vehicle underground to reach the various rooms/buildings.

I am not affiliated with the owners of this site or any of the companies located there.

If a good way to map/tag this can be found, there are some other facilities in the KC area (Downtown Underground, Space Center, Meritex) that should be mapped the same way.