Poseidon Undersea Resort (Katafanga Island, Fiji)
The price tag: unavailable
The Poseidon is the world’s first “one-atmosphere” underwater resort. Basically, that means the pressure underwater is the exact same as that on land, so guests won’t have to deal with any physiological adjustments. That “one-atmosphere” gimmick, along with its five-star suites and villas, also suggests the Poseidon is one of those places us regular working folk will never have the opportunity to actually visit. Because money.