The Quebec Bridge under construction in 1907. 

August 29th of the same year, the bridge, four years into it’s construction, would collapse into the St. Lawrence within 15 seconds, leaving 75 out of a total 86 workers dead. By 1916 another take on the bridge was underway, when on September 11th the central span collapsed and 15 workers died. The bridge opened in 1919 after 16 years of work.