[familyop]

It's not mysterious. In fact, it and the identity behind it are very obvious, and it reflects the recent direction of influence over our nation.

Georgia Guidestones
Wikipedia

In June 1979, an unknown person or persons under the pseudonym R. C. Christian hired Elberton Granite Finishing Company to build the structure.[2]
[...]
A message consisting of a set of ten guidelines or principles is engraved on the Georgia Guidestones...
1. Maintain humanity under 500,000,000 in perpetual balance with nature.
[...]
3. Unite humanity with a living new language.
[...]
6. Let all nations rule internally resolving external disputes in a world court.
[...]
10. Be not a cancer on the earth — Leave room for nature — Leave room for nature.

[bgill]

Also from wiki, “pseudonym” is mispelled.

[ctdonath2]

It’s a pseudonym for someone otherwise not identified/identifiable. That known contractors were hired to do a job doesn’t mean the patron & motive isn’t mysterious.