Explorers in China have uncovered a giant sinkhole in Guangxi province, revealing an ancient world hidden beneath the earth's surface.

In a remote corner of southern China, a giant sinkhole has unveiled an extraordinary underground cave system, sparking excitement in the world of geology. Known as Hong Kong ‘Haiting Hall’, this ...

, 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, ...