From http://www.thebirdman.org/Index/Temp/Temp-8AmazingHoles-EH.htm
8 Amazing Holes on Planet Earth!These holes are not only amazing, but so me 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
Apparently the largest ever hand-dug excavation in the world, this 1097 meter
Deep mine yielded over 3 tons of diamonds before being closed in 1914.2. Glory Hole - Monticello Dam, California
A glory hole is used when a dam is at full capacity and water needs
To be drained from the reservoir
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 consu me 14,400 cubic feet of water every second.3. Bingham Canyon Mine, Utah
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.4. 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.5. Mirny Diamond Mine , Serbia
This one is an absolute beast and holds the title of largest open
Diamond mine in the world. At 525 meters deep, with a top diameter
Of 1200 meters, there's even a no-fly zone above the hole due to a few
Helicopters having been sucked in.6. Diavik Mine , Canada
The mine is so huge and the area so remote that it has its own
Airport with a runway large enough to accommodate a Boeing 737.
It looks equally cool when the surrounding water is frozen.7. Sinkhole in Guatemala
These photos are of a sinkhole that occurred early this year in
Guatemala . The hole swallowed a dozen homes and killed at least 3 people.8. And the most terrifying one of all
This is the famous 'Rat Hole' that you have heard about.
It is capable of swallowing trillions and trillions of U.S.
Dollars... Annually! Never to be heard from again.
Didn't see that coming, did You?