"Radisson Collection Hotel, Berlin (formerly Radisson Blu Hotel) has a variety of accommodations on offer, from cathedral view rooms to the spacious Nikolai Suite, but we’re particular fans of the Aquarium View rooms, which look directly out over the famous 264,000-gallon cylindrical aquarium in the wondrous hotel lobby atrium. While these rooms aren’t technically underwater, the effect is essentially the same—falling asleep to the sight of tropical fish and dreamy blue waters. Nightly rates from: $283" - Caitlin Morton, Jamie Spain