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
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 in Guatemala
This photo is of a sinkhole that occurred February 2007 in Guatemala . It swallowed two dozen homes and killed at least three people.
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