The document describes and ranks 7 of the largest holes in the world, including the largest open diamond mine in South Africa, the largest hand-dug excavation diamond mine in South Africa, the largest glory hole drain at the Monticello Dam in California, the largest man-made excavation which is the Bingham Canyon Mine in Utah, the large circular Great Blue Hole off the coast of Belize, the large Diavik diamond mine in Canada's Northwest Territories with its own airport, and a large sinkhole that swallowed homes in Guatemala.