Australia's Perth Mint unveiled the world's biggest, heaviest and most valuable coin ever made. Crafted from pure gold, the coin that measures 80cm wide and more than 12 cms deep, weighs a whopping 2,200 pounds. The front of the masterpiece features Australia's national symbol — the kangaroo. Surrounding it are rays of sunshine and an inscription that reads Australian Kangaroo 1 Tonne 9999 Gold, as well as, the year 2012. The back features the continent's head of state — Her Majesty Queen Elizabeth II.