In the heart of the Karakum desert of Turkmenistan the
Darvaza Gas Crater or The Burning Gates give off a glow that can be
seen from miles away during the dark night.



(Image credit:JohnBradley)
The Kimberley Diamond Mine (also known as the Big Hole)
holds the (disputed) title of being the largest hand-dug hole in the
world. From 1866 to 1914 50,000 miners dug the hole with picks and
shovels, yielding 2,722 kg of diamonds.
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Source photos: Wikipedia
The Monticello Dam is a dam in Napa County, California,
United States most noted for its large circular spillway with a rate of
48,400 cubic feet per second.
The Bingham Canyon Mine is a copper mine in the Oquirrh
mountains, Utah. The mine is 0.75 mile (1.2 km) deep, 2.5 miles (4 km)
wide. It is the world’s largest manmade excavation.(Source:
CRIENGLISH.com/china.org.cn)

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Source: Wikipedia
The Great Blue Hole is an underwater sinkhole off the coast of Belize. The hole is 1,000 feet across and 400 feet deep. It was formed as a limestone cave during the last iceage.
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Image via Neatorama
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Image Via Gadling

The Mirny Diamond Mine is 525m deep and has a diameter of 1200m. It was
the first, and one of the largest, diamond Pipes in the USSR. It is now
abandoned. While it was still operational, it would take two hours for
trucks to drive from the top to the bottom of the mine.



Image source: Wikimapia
The Diavik Mine is a mine in the Northwest territories
of Canada. The mine (opened in 2003) produces 8 million carats or about
1,600 kg (3,500 lb) of diamonds every year.

Image source: Xinhuanet

Image source: Wikipedia
On February 26, 2007, a 300 foot deep sinkhole
swallowed a dozen homes in Guatemala. The sinkhole was caused by rains
and an underground sewage flow.


Image source: Nationalgeographic
Image source: Wikipedia
Chuquicamata is an open pit copper mine in Chile. It is the mine
with the largest total production of copper in the world - though it is
not the largest copper mine. The mine is over 850 meters deep.

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