Just wanted to share that in my country (Spain) and more concretely in my area (rural part of Catalonia) we have a building technique called “Pedra Seca” literal translation is “Dry Stone”. It basically involves building stuff with just rocks, nothing more. It’s still in use mostly in agricultural fields.
Here are a few examples:
https://dd9de8c7b7.cbaul-cdnwnd.com/b5fbcf0e77b7b72ef95acd62...
https://static1.ara.cat/clip/98e3619e-8dd2-4c0b-828c-254a62e...
The google search:
https://www.google.com/search?client=safari&sca_esv=58408328...