I dunno, Coral Castle was built by one man, (likely (IMO) using the method rediscovered by Wally Wallington.) https://en.wikipedia.org/wiki/Coral_Castle https:

I dunno, Coral Castle was built by one man, (likely (IMO) using the method rediscovered by Wally Wallington.) https://en.wikipedia.org/wiki/Coral_Castle https://en.wikipedia.org/wiki/Coral_Castle https://en.wikipedia.org/wiki/Wally_Wallington https://en.wikipedia.org/wiki/Wally_Wallington