How to tag a modern era menhir?

Since the day humankind discovered rocks they arranged them in special configurations. One is known as menhir https://wiki.openstreetmap.org/wiki/Tag:megalith_type%3Dmenhir .

Apparently around 45 B.C. some guy in the in the Armorica region in northern Gaul ran a successful business, making, selling, and delivering them by hand. But even today people still like menhirs. People errect long stones or rocks in an upward position. Which poses the question:
How can I tag such a modern day “menhir”? Obviously not an archeological site, and neither the tag historic:civilization=* allows for the modern era European civilization.

I’d consider this as artwork: https://wiki.openstreetmap.org/wiki/Tag:tourism%3Dartwork
Maybe something like https://wiki.openstreetmap.org/wiki/Tag:artwork_type%3Dstone ?