"All the gold ever mined would only fill one large swimming pool."
asks "Really?"http://en.wikipedia.org/wiki/Gold_reserveIt has been estimated that all the gold mined by the end of 2009 totaled 165,000 tonnes.
Gold density: 19.3 g/cm^3
165,000,000,000 / 19.3 = 8.5*10^9 cm^3
Cube root gives us a gold cube with each side of length 2044cm, so about 20m x 20m x 20m.
Said cube at today's market valuation would be valued at $7.6 trillion.