While I acknowledge there may be some nuance in this particular scenario (every place has its own customs and needs), the idea of “locals” holding that sort of sway over publicly available data is also very insular, very divisive, very “us vs them”. In my experience, that same attitude gets applied to new people that move to the area (and who would undoubtedly benefit from the ability to navigate around this new environment, and to learn about it).

The “locals” would prefer things to stay “local”, i.e. knowledge is only for those that already have it. In that direction lies not only a raft of other extremes of attitude, but also a sociological dead end.

Perhaps this is still to vote in your video entry - but the one Diarmuid & Grainne’s reference I’m aware of from outside the mapping scene (and possibly one of the most impressive examples you’ll see on the ground) is Diarmuid and Grainne’s Bed Cave or Diarmuid and Grainne’s Cave in County Sligo.

It’s a massive cave entrance, high up on the side of the blind Gleniff Horseshoe valley, north of Sligo town, up a very steep slope (and also requiring crossing private land for access, so permission may need to be obtained before visiting). I think it’s the highest cave entrance in Ireland, although I’d need to check some sources on that. Heres the node.