How would it feel like to sleep outdoors under the stars in one of the most glorious mountainsides in the world? A pop-up hotel named "Zero Real Estate" in Switzerland may help one realize that dream. /CFP

Inspired by Swiss artists Frank and Patrik Riklin and Daniel Charbonnier, the hotel constituting seven suites without walls and a roof, has opened. /CFP

The art installation-like suites are scattered across seven different tourist destinations in eastern Switzerland and the Principality of Liechtenstein. One can immerse in the fresh air and the beauty of the mountains with vineyards and villages in the distant during the day, and enjoy the blanket of stars overhead by night. /CFP

In addition, after the guests wake in the morning, breakfast is served in bed by a butler. According to the hotel's website, each suite costs from 295 Swiss Francs per night (308 U.S. dollars), with butler service and breakfast included. /CFP