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British Virgin Islands,

British Virgin Islands,

La Gruta Azul (Grotta Azzurra) is a remarkable marine cave on the coast of the Isle of Capri, Italy.

30+ mysterious caves, a deep walk into the heart of the earth

Hawaii is on a lot of people's travel bucket list. You may think sand beaches and volcanoes, but formations like this are breathtaking. What's your favorite thing about Hawaii? (Na Pali Coast Waterfall Cave, Hawaii)

Valle Verzasca, Switzerland

Diving in Verzasca River Diver in crystal clear water of Verzasca river in Ticino - Switzerland. Photograph by Marc Henauer (Not "the sea", but it fits).

Tube Shark Tunnel- This is also at the Atlantis and the picture does this ride no justice. its scary and at the same time the coolest slide I have ever been on in my life. Sharks swimming below,above and all around you as you float on this tube protected by plexy glass

Atlantis The Palm, Dubai Is a Luxury Resort With Giant Marine Habitats

Float through a shark lagoon, at the end of the tube waterslide in the Aquaventure water park at Atlantis The Palm, Dubai. Going here this year!