What would cause a device used to detect paranormal activity to suddenly exhibit a behavior never observed before? Can prayer change the way in which the other side interacts with those of us that are still living on this side? Ancient structures located throughout the American have provided a tantalizing and enigmatic puzzle for generations. Many have attempted to explain their existence by crediting their origins to Native Americans. But Native Americans state that these mounds were already in existence when they found them, and that they were constructed by giants!

• Documentary