The United States Bullion Depository, often referred to as "Fort Knox" is a fortified vault building located next to Fort Knox in Kentucky, which houses a large proportion of the United States gold reserves, among other precious items belonging to the federal government. The United States Bullion Depository holds 4,578 metric tons of gold bullion, which is approximately 3% of all the gold ever refined in human history. Despite this huge volume of gold held at the United States Bullion Depository, the Federal Reserve Bank holds 7000 metric tons of gold bullion, putting the United States bullion depository in second place for the largest gold reserve in the USA.