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.
Mammoth cave system is the largest or longest natural cave system in the world as well as in North America or USA. Situated in Kentucky, USA, this longest cave having 567 km of length.It is centered around the Green River, with a tributary and with 145 miles of passageways.lso it is regarded as the biggest or largest cave in Europe or EU. Jewel Cave it is the third longest cave in the world, with 108 miles of mapped passageways. It is located in South Dakotaâs Black Hills (USA). Jewel cave is open year round.