The Federal Reserve Bank of New York, reputedly the largest gold repository in the world, maintains a vault that lies 80 feet (24 m) below street level. The gold is owned by many foreign nations, central banks and international organizations.
See:
http://en.wikipedia.org/wiki/Federal_Reserve_Bank_of_New_York
http://en.wikipedia.org/wiki/Official_gold_reserves
http://cryptome.org/eyeball/gold-vault/gold-vault-frbny.htm