All the gold ever mined fits into two Olympic pools

If you gathered every wedding ring, gold coin, and computer circuit board ever made, the resulting pile of gold would measure just over 212,000 tonnes. Because gold is virtually indestructible and nearly impossible to find in high concentrations, the world's total supply grows by only one percent every eighteen months. This extreme physical scarcity is why central banks still hoard more than 36,000 tonnes of the metal as a fail-safe against economic instability.