Lecture on Bridges

General purpose of this lecture is to present on Bridges. Bridges is a structure carrying a road, path, railway, etc. across a river, road, or other obstacle. This lecture briefly describe on what does a bridge need. A good bridge must have a firm foundation;  must be sturdy and must last a long time. Here focus on top ten Bridges like: Chesapeake Bay Bridge; Sydney Harbor Bridge; Dames Point Bridge; Tower Bridge; Firth of Forth Bridge; Astoria Bridge and Golden Gate Bridge.