Do not use dietary supplements that contain iodine in the place of KI (potassium iodide). They can be harmful and non-efficacious. Only use products that have been approved by the U.S. Food and Drug Administration (FDA).
Mammoth Cave, the world's longest known cave system. The following is a list of the world's 10 longest caves per length of documented passageways. Many passageways are still being discovered; this list is based on the latest verifiable data.he highest concentrations of long caves in the world are found in the Pennyrile of Southern Kentucky, USA, in the Black Hills of South Dakota, USA, and in the Yucatan YucatÃ¡n, Peninsula. mexico
Cons: Some caves require much physical exertion and some are costly. Located in central Kentucky, Mammoth Cave National Park is the largest known cave system in the world, with more than 336 miles of underground caves that have been explored and mapped. This area was designated as a National Park in 1941.ammoth Cave can be described in one word: Massive! It&#146s the world&#146s largest cave system and it&#146s continuously growing each and every year. Even today, there are miles and miles of cave passages that have still not been explored and mapped.