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Sinkholes open up across large east coast city leaving residents terrified of falling into one

Sinkholes which have been appearing across Philadelphia have neighbors terrified that they'll go tumbling in as the city has failed to solve the problem. A series of sinkholes have been sparking ...
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It's big enough to swallow cities, deep enough to hide skyscrapers and inside lies an ancient, thriving 'lost world' cut off from everything above

At the bottom of a vast limestone chasm in southern China, a self-contained forest has taken root in near-permanent shadow, creating an isolated ecosystem that feels more like a lost world than a ...