Eventually the big Botticelli pictures were so identified with the soul of their country's heritage that Hitler buried them in a salt-mine with orders to destroy them if he lost the war.

BBC: Why money can't buy everything

Today, the library--one of the largest television collections in history--is stored 54 stories underground in a climate-controlled salt mine near Kansas City, Kan.

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Many are desperate to re-stock their road salt but supply chain pressures from mine to highway depot looks like resulting in some areas running dry.

BBC: Death-trap fear as salt runs low