A skybridge is a type of pedway consisting of an enclosed or covered bridge between two buildings. This protects pedestrians from the weather. However, with the development of architecture and construction in the past few decades, the look and purpose of the skybridges are to some extent changed.
So today we can see that in addition to the basic functions it performs, these unusual constructions serve, also, as observation platforms, luxury hospitality facilities, and works of art.
(thanks Bosko)