Gold is easily melted and reused for the purposes of the conqueror or thief. When Rome sacked Jerusalem any treasure became the property of the commanding general and after being shown off to the Roman citizens, it would be used to pay his legions and thousands of Jews became slaves. When Rome was sacked, was there any gold in the great temples? Had the Romans moved their golden treasures to Constantinople? Payed Huns not to invade?
If you combined all the gold on Earth, you would have a cube approximately 10 meters square.
the largest piles of gold are in Ft. Knox, the Bank of England, South Africa's gold repository, and wherever other nations choose to hide their gold reserves. Since the world markets revolve around dollars that are valued by America's GNP, gold is really only valuable as jewelry or for it's use as a metal.