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.iebenhengsteholen-system is the longest or biggest cave system of Switzerland, while sixth longest cave of the world with 140 km length. It is famous for its unusual greenery. It presents the most amazing natural scenery with its green routs and vegetation. Fisher Ridge Cave system was discovered in 1981.