No Man’s Fort (Solent, Portsmouth)
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The price tag: $700/night
No Man’s Fort isn’t exactly underwater, but it is on the water. It requires a trip by boat just to get to, and with 22 separate rooms and suites available, there’s every opportunity to turn it into your own private floating party. Their penthouse suite is actually a two-bedroom lighthouse with views of the sun deck — in case you want to be a creep, but privately.