SINKHOLES (UPDATED!)

A brilliant gallery of sinkholes around the World. 

http://www.telegraph.co.uk/news/picturegalleries/worldnews/9908055/In-pictures-sinkholes-craters-and-collapsed-roads-around-the-world.html

Golfer falls into sinkhole in USA.

http://abcnews.go.com/blogs/headlines/2013/03/golfer-swallowed-by-sinkhole/

The 'golfer' sinkhole is from soil collapse, not limestone 

and so is slightly different from those above.

Thanks to Jos for the update.