Null Stern Hotel, located in Teufen, Switzerland, takes the concept of minimalism to the extreme. This hotel has no walls or roof, offering guests a truly open-air experience. While it may not have a traditional discotheque, guests can create their own dance floor under the starry sky. The hotel provides portable speakers and lighting equipment, allowing guests to set up their own impromptu discotheque in the Swiss countryside. It's a unique opportunity to dance freely in nature, surrounded by breathtaking mountain views.