Magnetometer survey by Dr. Jarrod Burks in Ohio relocates part of the 1000 foot wide Shriver Circle, a now invisible Woodland Period (300 B.C. - A.D. 500) earthworks feature, suggesting that remote sensing can revolutionize our understanding of Ohio earthworks. Long before Stonehenge and the Egyptian pyramids, Neolithic people in Malta built many impressive megalithic temples. Then the temple builders vanished from the archaeological record. Our ALI film team goes to Malta to explore the temples and their mysteries.