Mirny Diamond Mine of SiberiaGreat Blue Hole – BelizeBurning Gates of TurkmenistanKimberley Big Hole - South AfricaBingham Canyon Mine – UtahGlory Hole in Monticello Dam CaliforniaDiavik Diamond Mine – CanadaGuatemala SinkholeChuquicamata Copper Mine – ChileUdachnaya Pipe – Russia
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