Located in the heart of the Swiss Alps, in Graubünden, the hotel Null Stern (Zero Stars in English) delivers for true nature lovers an unprecedented night under the stars. This "room" was imagined and created by hoteliers Frank and Patrick Riklin, without walls or ceiling for the sake of the panorama. It costs $245 a night, with a discount when bad weather arrives. It's worth noting the bathroom is a 10-minute walk.