These holes are not only amazing but some of them are really terrifying,especially #8. THe sheer scale of these holes reminds you of just how tiny you are.
1.)Kimberley Big Hole, South Africa
This is supposedly the largest man-made excavation on earth. Extraction began in 1863 and still continues today, the pit increasing in size constantly. In its current state the hole is miles deep and 2.5 miles wide.
(I didn't see that coming..... Did You?)