A modern and increasingly effective variant on the suspension bridge is the cable-stayed bridge, in which the cables are anchored in the tower, rather than at the end.  The cables may be attached in a radial pattern, extending from several points on the deck to the top of the tower, or in a parallel pattern, in which they are attached to different points on the towers, in parallel patterns.  The Yangpu Bridge in Shanghai, China (left), crossing the Huangpu River, is the third largest cable-stayed bridge in the world.  Together with its sister cable-stayed bridge, the Nanpu Bridge, and the Oriental Pearl Tower, they are considered two dragons playing with pearls. 

     Among the bridges featured on this site are the Puenta de la Mujer ("Woman's Bridge")  in the Puerto Madera section of Buenos Aires.  It is a combination movable and cable-stayed bridge designed by Spanish architect and engineer Santiago Calatrava Valls, built between 1998 and 2001.  Calatrava's website http://www.calatrava.com/ main.htm describes it as "a rotating suspension bridge." It is 335 feet long.  The spar can rotate ninety degrees to the pylon pictured directly below, allowing water traffic to pass.  The inclined pylon is 128 feet high.  The Leonard P. Zakim Bunker Hill Bridge in Boston, Massachusetts, was built as part of the "Big Dig" project that placed the elevated Interstate 93 underground and regained open space in the city.  Some have suggested that the cable-stayed bridge has replaced the cantilever bridge.

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