Ten Holes That Will Blow Your Mind

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Big Hole Kimberly South Africa photo
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The Big Hole in Kimberly, South Africa, was once a hill. When Erasmus Jacobs found a shiny pebble in the area in 1866, the diamond rush followed. The mine stakes a claim to being the deepest hand-excavated mine in the world, reaching a depth of 240m (787ft) before backfill and water collection left only 175m visible.

Image: Flickr, Irene2005