Braidwood is a city in Will County, Illinois, United States, approximately 53 miles (85 km) southwest of Chicago and 18 miles (29 km) south of Joliet. The population was 5,203 at the 2000 census. The Braidwood Nuclear Generating Station, a nuclear power plant currently owned by Exelon Corporation, is also located in the area (although the plant's address is actually in the nearby town of Braceville).
The Son Doong Cave in Vietnam is the biggest cave in the world. It's over 5.5 miles long, has a jungle and river, and could fit a 40-story skyscraper within its walls. But nobody knew any of that until about six years ago.
Bristish explorers have recently discovered that So Dong is much larger than the worldâs biggest known cave. The biggest section of Son Dong is five kilometers in length, 200 meters high and 150 meters wide, said Howard Limbirt of the British Cave Research Association team searching the area April 10-14, 2009.