Null Stern is a hotel with no walls and no roof in the middle of the Swiss Alps.
Guests can enjoy their night's stay under the stars – 4,000 feet above sea level.
The nearby farmer works as your butler. Together with breakfast, he also gives you daily news and anecdotes through a TV frame. Null Stern successfully launched its first room in 2016 which was even higher – 6,463 feet above sea level. One night costs around £240.