Postage stamps are repositories of history. They give a unique perspective into the history of its period and place. Philately, the hobby of collecting stamps, is known as the 'Mother of Hobbies'. Either due to some errors or other specialties, some of the stamps have acquired super star status among their kind. These stamps are held in high regard by the collectors and are estimated to be worth millions. Here is a list of 10 of the most valuable and rarest postage stamps in history.