Eiffel Tower
There were 50 architects, engineers, and draftsmen that created 5,300 drawings of the Eiffel Tower before the construction started. Once they had a plan, there were 18,000 pieces built and prepared in Eiffel's factory outside of town. These pieces were created to the accuracy of 1/10 of a millimeter. These pieces were put together to form new pieces that were 5 meters long to be transported to the building site.