1. Jules Undersea Lodge
Located in Key Largo, Florida, The Jules Undersea Lodge started its existence at the La Chalupa research laboratory in the early 1970’s. It has been an undersea lodge for last 30 years, and entrance by scuba diving only. Don’t worry, you don’t have to be certified to get access to this lodge, which is 21 feet underwater. The lodge offers a three-hour scuba course so that visitors can safely get to the location. Compressed air prevents the structure from flooding, and it also looks like a reef from the outside so that local wildlife can still have a place to settle.