Masuleh architecture is unique. The buildings have been built into the mountain and are interconnected. Courtyards and roofs both serve as pedestrian areas similar to streets. Masuleh does not allow any motor vehicles to enter, due to its unique layout. It is the only city in Iran with such a prohibition. However, the small streets and many stairs simply wouldn't make it possible for vehicles to enter. The spectacular architecture of Masuleh is popularly known as "The yard of the building above is the roof of the building below".
