But I don't think that it is anything mystical. McMullen could have instinctively read the lay of the land to determine where a logical place to build a structure would be, or he could have noticed some tiny traces that revealed where the structure was. Meanwhile, others don't notice these clues simply because they can't see the forest for the trees. McMullen's supposed ability might even be a largely subconscious process. In the taped interview given at the presentation, McMullen was asked how he performs this feat.
Psychics are too quick to promote paranormal explanations for perplexing events.
It seems they don't realize how complex and resourceful the human brain is. Remember, our brain is responsible for finding food, shelter and mates while avoiding crafty predators and dangerous situations. Attention to detail can mean the difference between life and death. Not at all. In any case, it is important to remember that humans have been in North America for a long time, and in just about any location you have some chance of finding some kind of artifact.