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6. Bank of England Vaults – London
The Bank of England is exactly as important as it sounds. In addition to regulating the British pound, it contains one of the largest gold reserves in the world. The gold vault was built in the 1930s, and stores over 400,000 bars. (Each bar weighs 28 pounds.) It may no longer be the main form of currency, but these gold bars are so exclusive that Queen Elizabeth got a private tour of the vault in 2012.