Valued exposure: Fort Knox
This photograph was taken circa 1937 and shows the Gold Depository at Fort Knox in Kentucky, USA, two years after President Roosevelt ordered its construction.
The project cost $560,000 and the first gold arrived by railroad early in 1937.
The Gold Reserve Act of 1934 effectively banned the private possession of gold and meant anyone in possession of anything other than historic coins or jewellery had to sell it to the Treasury.
Valued exposure: Tennis fashion