One of the greatest painters of all time, Leonardo da Vinci also was an exceptionally talented architect and engineer, producing sophisticated drawings of military weapons unlike anything that had been developed at the time. There is no evidence that these designs were ever constructed...until now. Discovery puts together a team of 21st century builders, engineers and historians to take on one of our greatest minds as they try to build da Vinci's weapons for the first time. With a contemporary team guiding the process, will these outrageous machines work? Or are the Renaissance master's genius ideas better left in the history books?