1. Famous pits
Some of the world's most famous sinkholes are seemingly endless pits that swallow trees, cars and entire buildings — dangerously altering the landscape. Others fill with water, becoming popular swimming holes and offering unique photo opportunities.

In the strictly geological sense, sinkholes occur when water erodes solid bedrock, creating an underground cavity that collapses inward. However, the term can be used in a broader sense to describe any sudden slump of the Earth's surface. Regardless of how you define them, these massive holes capture our curiosity with the mysteries of their bottomless depths.

2. The Great Blue Hole
The Great Blue Hole is a large underwater sinkhole off the coast of Belize that’s more than 1,000 feet wide and 400 feet deep. It formed as a limestone cave system during the last ice age when sea levels were lower, and the caves flooded as the planet warmed and sea levels rose.

Jacques-Yves Cousteau made the site famous in 1971 when he declared it one of the top 10 scuba diving sites in the world, and today it is a World Heritage Site.

3. Picher, Oklahoma sinkhole
The EPA calls Picher, Okla., the “most toxic place in America,” and today the city is a modern a ghost town. Years of mining for lead and zinc has left the town full of sinkholes like this one. The roofs of some of the mines — unable to support the weight of the earth — collapsed, and now the former municipality is home to only giant chat piles and numerous massive sinkholes.

@ the first picture

4. Cenote Ik Kil
Cenote Ik Kil (cenote means “natural well” in Spanish) is a large sinkhole on Mexico’s Yucatan Peninsula that’s sacred to the Mayans. The peninsula’s unique composition of porous limestone has resulted in several of these water-filled sinkholes, but Cenote Ik Kil is one of its most famous.

The hole is 90 feet deep, adorned in tropical vegetation and filled with clear blue water that Mayan royalty used for both relaxation and ritual sacrifices. This year Red Bull held its Cliff Diving World Series at the sinkhole — divers leapt from the cenote’s surface and reached speeds of 40 mph before entering the water.

5. The Great Ravenna Boulevard Sinkhole
One of the largest and most expensive sewer collapses in the United States occurred on the night of Nov. 11, 1957, in Seattle. The sewer trunk collapsed 145 feet below the street, but the massive sinkhole that resulted was just 60 feet deep. Repairs took two years to complete.

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6. Sinkhole guatemala

Related Topics: MNN lists, National Parks, Natural Disasters
El Zacatón
The El Zacatón sinkhole is the deepest water-filled sinkhole in the world. It was long considered to be bottomless, but in 1997 NASA solved the pit’s mystery when it sent an underwater robot into the waters and found the depth of El Zacatón to be 1,112 feet.

The clear, blue water is highly mineralized and has a sulphurous odor, and it’s quite warm — averaging 86 degrees Fahrenheit. The sinkhole’s name comes from the free-floating islands of zacate grass that blow across the lake in the wind.

7. Schmalkalden, Germany
A giant landslide under a residential street takes a car with it and leaves another car hanging over the edge in Schmalkalden, central Germany, on Nov. 1, 2010. (This sinkhole is more of the surprise variety, with not a lot of background to share at this point, but we thought you might find it noteworthy.)

8. Numby Numby
The Numby Numby sinkhole is located in Australia’s Northern Territory and is surrounded by high cliffs. An underground hot spring feeds into the pit, keeping the water a steady 90 degrees Fahrenheit. The water reaches a depth of about 200 feet almost immediately, and the sinkhole’s shallow waters along its edge are occupied by large lilypads.

The Australian Aborigines believed that Numby Numby was home to evil spirits.

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9. Montezuma Well
Montezuma Well is located in Arizona’s Montezuma National Monument Park. The sinkhole was formed during prehistoric times when a limestone cavern collapsed, and today it’s 365 feet wide and 55 feet deep.

Some 1.4 million gallons of water flow through the sinkhole each day from underground springs. The water of Montezuma Well is highly carbonated due to high levels of carbon dioxide, and the water contains very little oxygen and high levels of arsenic so it can’t support fish.

10. Devil's Den/Devils Toilet.
Devil’s Den is a fern-draped sinkhole in Williston, Fla., that is fed by underground springs. The water averages 72 degrees Fahrenheit, and on cold winter mornings, steam can be seen rising from the ground — thus, early settlers named the pit Devil’s Den.

The sinkhole’s clear, warm water makes it a popular diving and snorkeling site, and visitors to the cave can see ancient rock formations, stalactites and fossil beds.

Source: http://www.mnn.com/earth-matters/wilderness-resources/photos/13-amazing-sinkholes/devils-den#ixzz38cK0XJFG

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ammyluv2002: @ the first picture

Me self fear o, i don see that picture one time for facebook.