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The Aizhai bridge, the world\u2019s highest tunnel to tunnel bridge, at 336 meter-high (1,102 feet) and spanning 1,176 meters (3,858 feet), officially opens to traffic in Jishou, central China's Hunan province on March 31, 2012.AFP PHOTO


Aizhai is also the fourth suspension bridge in China to cross a valley so wide it seems to be connecting two mountain ranges, and of the world's 400 or so highest bridges, none has a main span as long as Aizhai. AFP PHOTO


<b>Qingdao Jiaozhou Bay Bridge</b><br>\nThe world&#39;s longest cross-sea bridge, spanning 36.48 kilometers across the mouth of the Jiaozhou Bay in China&#39;s eastern Shandong province, opened to traffic four years after construction started. Here&#39;s a peek into some of the world&#39;s longest bridges.


<b>Lake Pontchartrain Causeway</b><br>\nLocated in Louisiana, United States, the Lake Pontchartrain Causeway, consists of two parallel bridges that run parallel to each other. The bridges are supported by 9,500 concrete pilings and spans over 38.35 kilometres. The southern terminus of the Causeway is in Metairie, Louisiana, a suburb of New Orleans. The northern terminus is at Mandeville, Louisiana.


<b>Donghai Bridge</b><br>\nCompleted on December 10, 2005, the Donghai Bridge has a total length of 32.5 kilometres and connects Shanghai to the Yangshan port in China. The &#39;Donghai Bridge&#39; is popularly known as &#39;The stone&#39;.


<b>Chesapeake Bay Bridge </b><br>\nThe Chesapeake Bay Bridge is a four lane bridge that connects the Delmarva Peninsula&#39;s Eastern Shore of Virginia with Virginia Beach and the metropolitan area of Hampton Roads, Virginia. The bridge has a total length of 37 kilometres.


<b>Vasco da Gama Bridge</b><br>\nThe Vasco da Gama Bridge is a cable bridge with a total length of 17.2 kilometres. The bridge was opened to traffic on 29 March, 1998. The bridge spans across the Tagus River near Lisbon, Portugal.


<b>Penang Bridge </b><br>\nThe Penang Bridge opened to traffic on September 14, 1985 and connects Gelugor in Penang island and Seberang Prai to mainland Malaysia. The total length of the bridge is 13.5 kilometres.


<b>Rio-Niteroi Bridge</b><br>\nThe Rio-Niteroi Bridge is a box girder bridge that connects the cities of Rio de Janeiro and Niteroi. The bridge opened on March 4, 1974 and the total length of the bridge is 13 kilometres.


<b>Confederation Bridge</b><br>The 12.9 kilometre long bridge opened on 31 May 1997, connecting the Prince Edward Island with New Brunswick, Canada. The Confederation bridge is a two-lane highway toll bridge.


<b>San Mateo-Hayward Bridge</b><br>Commonly known as the San Mateo Bridge, the San Mateo-Hayward Bridge connects San Francisco Peninsula with the East Bay. The total length of the bridge is 11.265408 kilometres.