Living in a row of tents and sheds, the Colt Family kept to themselves on their little slice of land in southwest Austrailia.  Also dubbed the Colt incest clan, the Colts are an Australian family engaged in over four generations of incest.  The story starts with Tim and June Colt, a brother and sister from New Zealand, who moved to Australia and reproduced with one another, forcing their family members to do the same.  Here’s how authorities discovered the horrifying cult and uncovered years of abuse and neglect.

Have you heard of other cases as extreme as this? Let us know in the comments.