[Castiel sighs; behind his sunglasses, he rolls his eyes. Of course Dean would find the possibility of some gargantuan monster being behind all of this amusing; he would.

But then he starts mentioning cults, and the idea of something being worshipped, and that does catch Castiel's interest.]

The location of this town seems ideal for a cult, now that you mention it. Cut off, isolated. And it seems to have only housed a small population, if the size of the school house is any indication. I would say a cult is a good bet here, probably a cult worshipping some deity or other.