The World's 10 largest buildings

International Database and Gallery of StructuresBuild a BridgeBridge Building: Art and Sciencehttp://www.pbs.org/wgbh/nova/bridge/ Super Bridge and Bridge Band Aids Video(PBS)http://www.pbs.org/wgbh/buildingbig/bridge/index.html Building Big - information about different bridges and THE BRIDGE CHALLENGE

http://www.pbs.org/wgbh/buildingbig/skyscraper/index.html Building Big - information about skyscrapers and THE SKYSCRAPER CHALLENGE
http://www.hevanet.com/bridgink/ -bridge of the monthhttp://www.bridgeclimb.com/ -climb bridges
http://www.endex.com/gf/buildings/bbridge/bbridge.html - Brooklyn Bridge website