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Making a mistake at work is usually not a big deal; maybe you messed up a customer's order or forgot to enter something in a document, it's likely easy to fix; but there are cases where a mistake can end up costing billions of dollars to fix. From the Piper-Alpha oil rig disaster to the Honshin Expressway collapse here are some examples of the most expensive mistakes in history, but before we get started here's today's question: Who built the Eiffel Tower? Answer in the comments and stay tuned to find out the correct answer and now watch out here we go!