9. Tacoma Narrows Bridge

Location: Tacoma, WA

Year of Fail: 1940

Opened to the public on July 1, 1940, this suspension bridge collapsed—rather spectacularly—a mere four months later. Workers noted that the bridge, which they called “Galloping Gertie,” had oscillated even as it was being built, even causing seasickness for some. Lack of a truss and inadequate girders, both efforts to keep construction costs low, were to blame for the collapse, which miraculously had no human casualties.