Hey, history lovers. I'm Mike Rosenwald with Retropod, a show about the past, rediscovered.

Put yourself in this scenario. It's World War II, and you're King George VI of England. The Nazis are

advancing across Europe. You fear an invasion of England could come at any moment.

In your possession are the crown jewels.

These include two of the largest diamonds in the world, which are part of a collection of some 140

ceremonial objects used to crown a sovereign.

How do you protect them?

Here's what the real King George did.

He hid them away where they couldn't be found,

in a location only he knew.

The jewels made it through the war unscathed,

and no one, including Queen Elizabeth,

who wore the jewels and her own coronation,

knew where they had been hit it, until recently.

A documentary crew from the BBC was putting together a film on the Queen

when they stumbled onto the unlikely answer.

They found that the crown jewels wrote out the war in a cookie tin.

Well, a biscuit tin tin if you're British.

Historian Alistair Bruce was researching then Princess Elizabeth's wartime visits to Windsor Castle.

That's the royal retreat 22 miles from Buckingham Palace.

He asked the royal librarian for information and was summoned to the palace.

It seemed that in searching for the information, the librarian had uncovered long-unseen letters from one of his predecessors

...