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.
1 The nearby Clearwater Cave System is believed to be the world's largest cave by volume, with a calculated volume of 30,347,540 m 3 (1.071713 Ã 10 9 cu ft). 2  The largest passage ever discovered is in the Son Doong Cave in Phong Nha-Káº» Bang BÃ ng National park In Quáº£ng Binh, BÃ¬nh.  province vietnam The cave system with the greatest total length of surveyed passage is Mammoth Cave in Kentucky, USA, at 643 km (400 mi). 2  This record is unlikely to be surpassed in the near future, as the next most extensive known cave is Jewel Cave near Custer, South Dakota, USA, at 267 km (166 mi).