Conrad Maldives Rangali Island—Rangali Island, The MaldivesVia conradhotel.com
This island resort is famous for its Ithaa Undersea Restaurant, the world’s first all-glass dining establishment completely submerged underwater. (These one-of-a-kind restaurants around the world will blow you away.) It’s also one of the only locations in the world where you shouldn’t be afraid of sharks staring at you. Above ground, Conrad Maldives Rangali Island provides spectacular views of the Indian Ocean. Stop for a unique massage in the Over Water Spa, tiki hut-style rooms with glass floors that allow you to watch colorful fish swim below you during your treatment.
The Manta Resort—Pemba Island, off the coast of TanzaniaCourtesy, themantaresort.com
The most exciting part of this hotel isn’t even attached to the hotel. It’s called the Underwater Room, your own private floating island where you can sleep under the sea or under the stars. (Check out more stunning vacation spots that let you sleep outside and be one with nature.) A boat takes you from the mainland to your little paradise. The landing deck with a lounge area and bathroom is at sea level. Climb up the ladder to sunbathe or stargaze on the rooftop, or head below deck to your bedroom for a nearly 360-degree view of underwater life. Prepare to see exotic fish, squid, and even an octopus during your stay at the Underwater Room.