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1. Kimberley Big Hole, South Africa



2.Glory Hole ? Monticello Dam, California'



3. Darvaza Gas Crater



4.Chand Baori



5.Sinkhole in Guatamela



2.Glory Hole ? Monticello Dam, California'
3. Darvaza Gas Crater
4.Chand Baori
5.Sinkhole in Guatamela