Sinkholes are a fascinating and terrifying natural phenomenon. They are formed by water dissolving rock and they can be thousands of feet deep. You can find sinkholes all over the world and some have ...

Giant sinkholes discovered containing untouched ancient forests ...

A Pennsylvania grandmother was found dead last December after falling into a 30-foot deep sinkhole that opened into a long-abandoned coal mine. Elizabeth Pollard, from Unity Township, had been looking ...

, Sept. 30 -- Sinkholes are sudden holes that open up in the ground when the surface layer drops into empty spaces below. They can be as small as a dip in a garden or so big that they swallow houses, ...