3. Jules Undersea Lodge, USA
Have you ever wanted to make like a mermaid and spend a night underwater? The Jules Undersea Lodge at the Key Largo Undersea Park in Florida was the first submerged hotel of its kind anywhere in the world. If you’re not a certified diver, you’ll need to take a brief diving course to stay there, since it involves diving down 21 feet to get to the entrance of the fully equipped underwater habitat. There are a few other underwater hotels and restaurants popping up in places like Dubai, Fiji and the Maldives, so there’s obviously a demand for this kind of unique submarine experience.

4. Lost city of Heracleion, Egypt
Not to be confused with the city in Crete, Thonis-Heracleion is an ancient Egyptian city that disappeared beneath the waves 1,200 years ago. Thought to be nothing more than a legend for centuries, now marine archaeologists have begun to explore these expansive undersea ruins. This real Atlantis-like city was only rediscovered in 2000, and since then, numerous statues and artifacts have been recovered from it. Nobody knows how or why it submerged, which adds to its mystique. It’s not quite ready for commercial dive operations, but this will be a stunning site to see when it is.
