Though the current marketing world is very different from the one that dominated the advertising field several decades ago, today's marketing specialists should still know about the most successful marketing campaigns of the past. Why? Because they show us general trends that are even universally applicable today, and when properly used, could help you make a powerful campaign that engages a large audience. This is why today we will look at five big marketing campaigns that are considered by experts as the most successful and most powerful in history.