Georgia Guidestones - Huge granite stones inscribed with words of advice that the author intended to “guide humanity forward”, destroyed in 2022

They didn't seem terribly useful, compared to other long projects.

Maintain humanity under 500,000,000 in perpetual balance with nature.
Guide reproduction wisely – improving fitness and diversity.
Unite humanity with a living new language.
Rule passion – faith – tradition – and all things with tempered reason.
Protect people and nations with fair laws and just courts.
Let all nations rule internally resolving external disputes in a world court.
Avoid petty laws and useless officials.
Balance personal rights with social duties.
Prize truth – beauty – love – seeking harmony with the infinite.
Be not a cancer on the Earth – Leave room for nature – Leave room for nature.

Basically, a freethinker version of the Ten Commandments tablets.

Openly advocating genocide and eugenics? Yeah, definitely not what I would call useful
- If you read "Guide reproduction wisely - improving fitness and diversity" as eugenics and genocide, I think you might be jumping the gun a bit based on personal biases. Population bottlenecks require you to be very careful about species-wide gene pools. In a population of 10,000, you don't want Cletus reproducing with his first cousin.
- You could argue the opposite, genocide would be guiding reproduction away from diversity.
The listed weights and dimensions are the most useful things to me. Knowing the approximate weight of a kilogram and length of a meter would be incredibly useful when trying to recreate things you find in records

Conspiracists attributed nefarious intent on these stones. I learned about them from a podcast that studies conspiratorial thinking. I didn't realize they'd been destroyed. I kinda think I heard that ep after the time when they were bombed, so maybe that was mentioned and I didn't internalize it.

Heads-up: conspiracy people are potentially dangerous. They blew up these stones that were probably pretty trivial / harmless. They have shot people for perceived great-replacement bullshit (synagogs). This shit isn't just amusing and stupid. They're irrational and they can project and cause harm.

An entertaining watch on the Guidestones prior to its destruction: https://youtu.be/AEa3sK1iZxc

The supposed creator was a fan of David Duke of the KKK…

Why was it destroyed?

A politician said they were satanic. So someone bombed them. People are crazy.
https://www.nbcnews.com/news/us-news/georgia-monument-called-satanic-gubernatorial-candidate-destroyed-expl-rcna37039
It was bombed, as some people in our society deemed it "satanic".
Post-2020 republican doomerism
Source: I live nearby
These had their version of the Ten Commandments in eight languages. I suppose it was bombed because mah gud.

Good riddance for probably wrong reasons. Shame they plan to rebuild this crap. Guidestones for thinly veiled eugenics and genocide, they were. Blergh.

Are they rebuilding them? I live somewhat nearby and last I heard there were no plans to rebuild the stones. Do you have a link to that?
- In late July 2022, Elberton Mayor Daniel Graves said the town planned to rebuild the monument exactly as it was, adding "We're just getting geared up and excited about rebuilding them.
  From the linked Wikipedia article.

If they were meant to survive nuclear apocalypse, then why did one small non-nuclear bomb bring them down? You'd think they should be better constructed or protected or something.

They were quite likely put up by folks that believed the same wack job shit as those that destroyed them.

From what I’ve read on Wikipedia, this monument was poorly thought-out, but very well designed and rather badly executed. No major loss, in that case.