Mirny diamond mine Siberia
This holds the title of largest open diamond mine in the world. At 525 metres deep with a top diameter of 1200 metres there’s even a no-fly zone above the hole due to a few helicopters being sucked in
Note the red arrow that is one of the huge trucks ..and i mean HUGE that takes the rubble away
Kimberley big hole - south Africa The largest ever hand-dug excavation in the world, this 1097 metre deep mine yielded over 3 tonnes of diamonds before being closed in 1914.In 1870, diamond diggers discovered stones at the Bultfontein, Du Toits Pan, and Vooruitzight farms, and in 1871, an 83.50 carat diamond was found on the slopes of Colesberg Kopje, leading to the first diamond rush into the area.
Miners began arriving by the thousands, and the hill at Colesberg Kopje began to disappear, replaced by a gigantic open-pit mine that became known as the "Big Hole". Kimberley began as a town called "New Rush" and was renamed Kimberley on June 5th 1873. Kimberley was named after the British Secretary of State of the Colonies, John Wodehouse, 1st Earl of Kimberley. A diamond trader/speculator from England, named Barney Barnato systematically bought up pieces of the Big Hole to eventually create the Kimberly Mine
Glory - hole Monticello dam a glory hole is used when a dam is at full capacity and water needs to be drained from the resevoir. this is the glory hole belonging to monticello dam in california and it’s the largest in the world, its size enabling it to consume 14′400 cubic feet of water every second
If you fell in this is where you would pop out!
Bingham canyon mine, utah
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 3/4 mile deep and 2.5 miles wide.
Great blue hole, Belize
Situated 60 miles off the mainland of Belize is this incredible ‘geographical phenomenon’ known as a blue hole. There are numerous blue holes around the world but none as stunning as this one.
At surface level the near perfectly circular hole is 1/4 mile wide, the depth in the middle reaching 145 metres. Obviously the hole is a huge hit with divers. I have dived in the blue hole and it was great..mind you the amaricans I was with went a bit over the top you would have thought they had just had a religious experience.
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HERE
Sinkhole, Guatemala
a sinkhole is caused when water (usually rainwater or sewage) is soaked up by the earth on a large scale, resulting in the ground collapsing. 3 people died in the 330-foot-deep sinkhole. 
Diavik mine, Canada This incredible mine can be found 300km northeast of Yellowknife in Canada.the mine is so huge and the area so remote that it even has its own airport with a runway large enough to accommodate a Boeing 737. it also looks equally as cool when the surrounding water is frozen Diamonds were first discovered in the area in the early 1990s and the site was deemed economic to mine in 1995. In early 2003, construction of the mine was completed. The mine, which currently has a footprint of approximately 10 square kilometres, is projected to produce approximately 110 million carats of diamonds over its mine life of 16 to 22 years.
Barringer Meteor Crater It is a located approximately 58 miles (93 km) east of Flagstaff, near Winslow in the northern Arizona desert of the United States. The site was formerly known as the Canyon Diablo Crater, and scientists generally refer to it as Barringer Crater in honor of Daniel Barringer who was first to suggest that it was produced by meteorite. The crater was created about 50,000 years ago during the Pleistocene epoch when the local climate on the Colorado Plateau was much cooler and damper. At the time, the area was an open grassland dotted with woodlands inhabited by woolly mammoths, giant ground sloths, and camels; it was probably not inhabited by humans. The object that excavated the crater was a Nickei-iron meteorite only about 50 meters (54 yards) across,
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16/07/08 @ 12:55