Coin collecting, or as its otherwise known as, ‘the king of hobbies’, has captivated kings and kids alike since as early as the 14th century. Whether it is for the value of the metal itself, their ‘mint’ condition (or even flaws – you might be surprised how much a ‘mule’ is worth!), their commemorative or historical significance, or merely a personal attachment, these shiny little things can really burn a hole in your pocket!  Take a look at the most expensive coins money can buy.