Not entirely to do with nature, but part of the landscape of many places. However, in England, apart from 3 that exist at Oxford and Cambridge, which are covered in the sense that they are bridges connecting 2 buildings, there is only one that I know about. Even that bridge is ornamental, in that it lies withinn a park, and has never been used for road traffic. It is the Swiss Bridge at Birkenhead Park on the Wirral peninsula.
I have been told that this kind of bridge was quite common in the UK in bygone times. I think they are so romantic and picturesque and its a pity we dont have them anymore. I know that in USA and Canada, also in other parts of Europe they still exist.