6 July 2009
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.
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 wate
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 stun
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