Spain can get messed up quickly. There is a system that many don't observe. Some old properties never have been registered. Sales made by handshake 150yrs ago. I was going to buy a millhouse dated back to 1640 in Galicia, millsite occupied since Roman times, until we found that the land registry had some other person listed, who died, no clear line of inheritance, as the owner of the canal that brought the water up to the house. They kept that info secret. I refused to buy it, as they could not produce clear title. What is a millhouse without clear title to water access? Then I lost my case when I sued them to get my 25k€ deposit back, appealed that ruling, and then 5yrs later lost again. Theoretically all of that should have been entered into the national registry, but the law was totally ignored. Buy it, or lose your deposit. A lot of places is really simple, if you occupy it, you own it. Everybody understands that system. It's the unrule of law that can really mess things up. If I understood that, I'd own a millhouse and be generating 3 kW by now.
--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."