A most interesting story. I only just found out . Griffith is the nearest town with the highest population to where I am. https://en.wikipedia.org/wiki/Valerio_Ricetti
This reminded me of an another dude who lives in a cave -- Daniel Suelo. Here is a link to his blog, which he created using computers in public libraries, colleges and universities. https://sites.google.com/site/livingwithoutmoney/Home/4--what-do-you-do-for-shelter Mark Boyle is an another individual who voluntarily lives without money and makes a living as an organic farmer and uses the barter system to exchange his produce for other commodities.
I took notice (via tv ) of a guy living in a cave on Ibiza. Since its not his property and its a nice cave with a great view outside he gets lot of intruders lol (in the form of tourists)
well not every cave. those deep underground caverns, sure, but there's plenty of holes in the rock that count as caves and get the full brunt of the summer heat.