An assigned [event] administrator could take on this job in between dealing with events.

That person could simply take the time as part of their job to get a list of the popular visits behind closed doors, then take note of them after visiting and see which are notable.
Then we end users will just notice an update once in a while when a visit gets removed or added.
Curated list from "this is a popular grinder lately" to "not a dirt hut" and because it's a person doing this, they can take into account if the owner of the visit is actually an active player, and all that stuff. Things that could make it as simple: .. towns, wilds, spots, builds, event area, etc .. notable things. Obviously the locations change over time as players come and go ..