3. The Winter Park Sinkhole in U.S. Florida
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In May 1981, during a period of record-low water levels in Florida's limestone aquifer, a massive sinkhole opened up underneath the city's public swimming pool, which is near the corner of Denning Drive and Fairbanks Avenue. In a single day the hole widened to 98 meters and to a depth of 27 meters, destroying an import car dealership, a public pool, and large portions of Denning Drive. In addition, the sinkhole "ate" an entire two-story home. (Source: sina.com.cn)
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