How did Leonardo da Vinci influence the renaissance?

How Leonardo da vinci influences todays living is the fabled " Da Vinci Code". Nearly four films have been made about this 'code' a many people have spent their whole lives searching for the answers to the the "Da Vinci Code" which might reveal the secret location of the Holy Grail. So many people have given their lives for something that might not exist, but still people search for it.