Construction of the Sydney Opera House took 16 years, with construction beginning in 1957 and finishing in 1973. The design and complications in various areas made the project a large source of debate regarding the time and money spent on the project.
One example of the issues that the designers and builders ran into was how to actually build the roof sails that the designer Jorn Utzon created. It took the group working on the building almost 4 years to figure out a solution to the problem. Other various issues arose over the years, but in the end the Sydney Opera House is an architectural masterpiece known worldwide.