Utter Inn
Would-be mermaids and mermen rejoice: The Utter Inn, a one-room hotel lying three meters below the surface of Lake Mälaren, about an hour west of Stockholm, Sweden will have you sleeping with the fishes. Reachable only via inflatable boat, the basic room (which consists of twin beds, a table, and panoramic underwater views of the lake) lies in the depths beneath a floating red house, and overnighting here is tantamount to spending a night in an aquarium. Should you need to surface for air, you can paddle across to a nearby uninhabited island and spend the day sunbathing, fishing, and swimming.
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$365+: Low fall fares to Scandinavia (one-way) Scandinavian Airlines
$449+: Round-trip Sweden, Denmark & Norway fares Icelandair
$746+: Fly economy extra to Scandinavia (one-way) Scandinavian Airlines