Sentinel Hill is a summit in the town of Dunwich. On it rests several stone pillars, as well as what appears to be a circular stone altar. These structures are generally believed to be the remnants of the Native American cult which practiced religious rites on the mound before the colonization of Dunwich. This hill also holds a large deposit of human bones. Residents of Dunwich claim they are the buried remains of the Pocumtuck Indians, though ethnologists maintain they are Caucasian in origin.
The elder Whateley was rumored to have performed a profane ritual atop Sentinel Hill before the birth of his wife's child, Wilbur Whateley.