1. Kimberley Big Hole , South Africa  Apparently the largest ever hand-dug excavation in the world. This 1097-meter-deep mine yielded over three tons of diamonds before being closed. 2. Glory Hole – Monticello Dam, California This is the Glory Hole at Monticello Dam and it’s the largest in the world of this type of spillway. Its size enabling it to consume 14,400 cubic feet of water every second. A glory hole is used when a dam is at full capacity and water needs to be drained from the reservoir. 3. Great Blue Hole , Belize   This incredible geographical phenomenon known as a blue hole is situated 60 miles off the mainland of Belize . There are numerous blue holes around the world but none as stunning as this one.  4. Sinkhole, Guatemala   This photo is of a sinkhole that occurred February 2007 in Guatemala . It swallowed two dozen homes and killed at least three people.  5. Rat Hole, Washington , D.C.  The Rat Hole is capable of swallowing trillions and trillions of U.S. dollars annually, never to be heard from again!