A building that is one of the most challenging engineering is bridge. The length and strength of the bridge, there are limits. Therefore, it requires skills in physics thinking plan. The stress calculations to see if the bridge can support the weight of a car or truck to drive across. There may be more challenging, such as the need to build bridges over deep valleys, canals or rivers. Handling of heavy equipment such as rollers, truck tractors, trailers, cranes and excavators to build a bridge to better and faster. There are many ways to build bridges such as
rope bridge or Arch Bridge. The challenge was to design a bridge as it is beautiful to look stylish as bridge such as Golden package. The City of San Francisco. Tower Bridge in London, England Brooklyn Bridge NYC. United States The Khaju Bridge Iran. Thank you