4. They found a heap of baby skeletons
“Not a realtor, happened to some friends who bought a property, very old site, about 300 years old which had been part of a convent, the living room of the nuns exactly. The aforementioned place had been refurbished as small apartments/houses about 50 years ago.
They went to live there and there was some maintenance given to certain places of the property (the common areas) there was a wall which was slightly wider than the others, they began to give maintenance to that wall but the outer layer fell apart (due to the rain and age) while trying to fix that they found dozens of skeletons of babies, very little babies and very old little skeletons.
Well, authorities and historians came and went by, and they came to the conclusion that the nuns tossed their babies there right after giving birth to them, lord knows if they were alive or dead by then.” — Moonwarden666