History of bridges The concept of bridges is to connect 2 areas. To go over or around an obstacle. The word bridge comes from English and German roots. In pre-historic times people built rope bridges and Suspension bridges.
Present day bridges Today bridges are used for roads and walkways. Specifically to get people places faster and more efficiently. Anywhere there is a frequently used walkway that goes over water there is or will be a bridge soon.
Future bridges The future of bridges is hard to say. I would think it would be floating so it doesn't mess with the landscape or interfere with boats passing underneath. Or maybe something smaller like a bridge for planes to land on safely.