The Secret of the Desolate Village

It seems from the way it is built and from a large number of the buildings it contains, it was highly populated in the past, and that most of its people were wealthy; so why have they left it?Every day after sunset, abnormal phenomena and weird horrors take place in it, so what's the secret behind all of that?Is this the reason why its inhabitants have left it? Or have these matters started to happen after they had actually left?