Bridges are great engineering marvels, but even the best of designs can fail when acted upon by the forces of nature. See footage of catastrophic bridge failures and hear the analysis of what caused the failures.

Originally released by A&E Networks, 2007. Streaming video file encoded with permission for digital streaming by Infobase on May 16, 2015.

Re-engineering The California Cyprus Viaduct (7:26); --Connecticut Bridge Collapse (6:40); -- Florida Skyway Collapse (7:06); -- Collapse Of The New York Thruway Bridge (7:16); -- The Point Pleasant And Seattle Floating Bridge (8:12); -- Indiana Highway Ramp Collapse (8:30);.