![Shibam, Yemen](https://mostbeautifulpicture.com/wp-content/uploads/2017/09/Shibam-Yemen-1024x682.jpg)
Yemen’s old walled city of Shibam is the oldest metropolis in the world to use vertical construction with mud (until 8 floors!).
Yemen’s old walled city of Shibam is the oldest metropolis in the world to use vertical construction with mud (until 8 floors!).