Close to the A169 near Pickering in North Yorkshire, England, is a deep hole in the ground rumored to have been the work of a legendary giant named Wade. The Hole of Horcum is a geological feature formed by spring-sapping, in which upwelling water eats away at the ground, creating valleys. This 400-foot-deep natural cauldron, which measures about three-quarters of a mile across, has evolved over thousands of years since the last ice age. The widening of a narrow valley has resulted in the heather-covered landscape we see today. Of…