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Many describe a bridge as a structure used a passage over physical obstacles like water, valley or land. A bridge can serve its purpose for rail, pedestrians and road traffic; it can be divided in several types with suspension and cable-stayed bridges being the most reliable. A bridge's efficiency depends upon its own mass and the load it can withstand. Nature has itself given hint to the construction of bridges to mankind, in the form of wooden logs used to cross an obstacle. Since then man has?constructed?various types of?bridges?which with the advancement of technology are more and more sophisticated. boss sunglasses Present day?bridges?are engineering marvels. Below discussed are some of the most famous and tourists appealing bridges in the world:
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The Golden Gate Bridge, San Francisco

The golden bridge connects San Francisco to Marin County. It was completed in 1937 as the longest suspension bridge. It was considered to be a big feat for structure engineering and structural achievement at that time. Over 100,000 cars daily cross the Golden Gate Bridge. It is considered to be a prominent landmark designer sunglasses for women in American structural feats.

Tower Bridge, London

Located in London the Tower Bridge stands still over Thames River. It was discount armani sunglasses completed in 1894. This 800 feet long bridge is one of the most famous landmarks in London. Its bascules are opened to allow river traffic. Approximately the bascules are raised 1000 times a year. The Tower Bridge is currently used for road traffic and pedestrians.

Oresund Bridge, Denmark ? Sweden

Oresund Bridge connects Sweden and Denmark. It was opened to traffic and trains in 2000.? The Bridge is 7,845 m long and costs about $3.2 Billion. This massive bridge took 5 years to complete.? It carries 60,000 cars, buses, Lorries and train from Sweden to Denmark and vice versa.

Sydney Harbour Bridge, Sydney