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13 amazing sinkholes

By: Laura Moss on Oct. 6, 2010, 11:22 a.m.
Speedway sinkhole in Charlotte

Photo: Charlotte Motor Speedway

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Speedway sinkhole

A sinkhole formed in the infield of the Charlotte Motor Speedway in North Carolina in September 2010 when a 30-year-old drainpipe deteriorated 35 feet underground. The speedway was built atop an old landfill, and heavy rains contributed to the underground collapse.