Most Expensive Construction Mistakes in the World (Part 4) #Megaprojectsbr br #Constructionbr br #Engineeringbr br World's Most Expensive Construction Mistakes. In this video, we take a look at two bridge collapses, the falling facade of the Aon Center, and an ex-navy shipyard in San Francisco. For more megaproject & construction content be sure to subscribe to Top Luxury.