this is the original galloping gertie's 1940 bridge. can see the two eight foot deep plate girders. it's called an open section. >> many lessons are learned from gertie's demise, including how critical aerodynamics are in building suspension bridges. >> there really wasn't a major suspension bridge built after galloping gerty collapsed until its replacement in 1950. and many of the things that exist on the 1950s bridge are a tribute to better aerodynamic stability. >> in 2007, a twin bridge is completed. the architectural look of both structures resembles the original gertie, a tribute to her grace and elegance. >> so that new bridge, as well as others have been constructed since 1940, are part of galloping gertie's legacy. >>> coming up -- an iceberg implodes in front of a group of tourists, sending them scrambling for safety. >> we're all shouting and screaming like what? >> when "caught on camera: watch out" continues. new business owner, it would be one thing i've learned is my philosophy is real simple american express open forum i