Police have speculated that she may have unwittingly walked directly onto a patch of grass that barely concealed a massive sinkhole, a remnant of extensive coal mining that ended in the early 1950s.

Sinkholes can range in diameter from a few feet to hundreds of acres. Their depths can be less than 1 foot to more than 100 feet. Some have vertical walls, others look like saucers or shallow ...

A new sinkhole opened up on I-80 westbound near the Route 15 overpass in Morris County while work crews were repairing an earlier sinkhole on the eastbound side of the highway.

Sinkholes are not always associated with mining. In 2013, a man was killed when a sinkhole opened up beneath his home in central Florida, where the porous limestone base gives rise to thousands of ...