I don't see anything comparable to this idea, but feel free to correct
me. I've been using Self Guided Nature Trails for a handful of Wherigo
ideas (e.g.
Nunatak
and
South
Plateau Trail Guide), and thought that they may be deserving of
their own Category.
Other nearby examples would be:
Monterey Path of HistoryJapantown, San Francisco History WalkSome
of these types of walks and trails have brochure guides, while others
have plaques near points of interest (often times Waymarkable in their
own right), as well as the common type that I have seen which involve
posts with numbers on them, which goes along with the trail guide:

Any thoughts, comments, and suggestions welcome.