Bridges
http://science.howstuffworks.com/28828-understanding-history-of-bridge-construction-video.htm
http://science.howstuffworks.com/29830-understanding-bridge-movement-video.htm
http://science.howstuffworks.com/29830-understanding-bridge-movement-video.htm
http://videos.howstuffworks.com/discovery/35894-howstuffworks-show-episode-12-steel-bridges-video.htm
http://www.discovery.com/tv-shows/discovery-presents/videos/we-built-this-city-new-york-the-brooklyn-bridge.htm
http://www.pbs.org/wgbh/buildingbig/bridge/basics.html
http://www.brantacan.co.uk/bridges.htm
http://science.howstuffworks.com/28828-understanding-history-of-bridge-construction-video.htm
http://science.howstuffworks.com/29830-understanding-bridge-movement-video.htm
http://science.howstuffworks.com/29830-understanding-bridge-movement-video.htm
http://videos.howstuffworks.com/discovery/35894-howstuffworks-show-episode-12-steel-bridges-video.htm
http://www.discovery.com/tv-shows/discovery-presents/videos/we-built-this-city-new-york-the-brooklyn-bridge.htm
http://www.pbs.org/wgbh/buildingbig/bridge/basics.html
http://www.brantacan.co.uk/bridges.htm