Every couple of years I’ll see a news report about a giant paper wasp’s nest in a house. Giant nest, not giant wasps. Doesn’t seem all that unusual. It probably only requires a warm climate or house warmed year round, and a sufficient supply of food. The best way to get rid of wasp’s nest is to burn it, but that may not be practical if it’s inside your house. I don’t know how people don’t notice these things. Even inside the walls you should hear the bugs crawling around.
I read about this case, and it’s very strange. I don’t remember all the détails, but IIRC the house he was living in was very valuable and it was discovered he owned other properties. However, he used to have some random blue collar job and how he came into possession of those properties is unclear. He probably inherited them or bought them from a woman with whom he had no know relation. Also, no trace could be found of him in Spain where he was supposedly born, hence he was most likely living under an assumed identity.
I found an article about it, and there’s an element I had forgotten : around the time of his death he was about to sell the house where he was found to a German woman. He didn’t show up to sign the papers, and the German lady can’t be found, either.