We ask though is there real gold there or fools gold?

A fifth of the world’s gold is hidden under London, worth an estimated £172 billion ($248 billion).

The vaults under the Bank of England on Threadneedle Street are said to hold 5,134 tonnes of gold.

This makes up the majority of the 6,256 tonnes kept safe beneath London’s streets, according to the BBC, which recently sent a reporter to visit the 300,000 square foot space.

Gold is measured in bars weighing precisely 400 troy ounces, or 12kg, worth around £250,000 ($500,000). Gold is used by investors as a safe asset to invest in when the stock market and other assets are more volatile, because it is so low risk.

The price of gold can thus be used a barometer for the confidence of investors. When it goes up, investors are looking to invest in gold because they may be worrying about higher risk assets.

It can also be traded and used as a way to exchange funds in a hard and universal currency.

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