If you've ever taken an interest in the royal family's vast collection of priceless jewels - including the Crown Jewels - you'll know they're kept behind bomb-proof glass at the Jewel House in the Tower of London.
The incredible and costly Crown Jewels very rarely leave the high security spot, which is covered by more than 100 hidden cameras, only ever released to be worn at special occasions, such as the State Opening of Parliament.
In fact, the Queen 's Crown Jewels are some of the most famous and priceless artefacts in the whole of the country, but according to MyLondon, they once had a very different home.
During the Second World War, the Firm felt that the jewels needed a new home, so they would be protected from falling into the hands of the enemy, and even the Queen herself had no idea where they would be housed.
While researching the topic, royal expert Alistair Bruce found "an electric set of letters," that had been written by royal librarian Sir Owen Morshead to Queen Mary, where he expressed his concerns for the precious jewels and how to protect them from falling into enemy hands.
Bruce explained how the Queen's father, then- King George VI then ordered a "deep hole" to be dug in the grounds of Windsor Castle "beneath a sally port, one of the secure entries to the castle, and two chambers constructed with steel doors."
He continued: "They dug out this fresh, very virgin white chalk and they had to hide it with tarpaulins so when the aircraft flew over at night no clue was given to the German Luftwaffe that anything was going on."
The best detail, however, is the fact that the most valuable jewels - the Black Prince's Ruby and St Edward's Sapphire - were removed from the Imperial State Crown and kept separately in the biscuit tin "in case of emergency."
At a later date, Bruce spoke with Her Majesty about his discovery and learned that while the Queen was aware the jewels had been hidden at Windsor Castle, she was not aware of the exact details.
In fact, it was he who told the Queen about the biscuit tin for the very first time, he explained to the BBC : "What was so lovely was that the Queen had no knowledge of it. Telling her seemed strangely odd."
As the Queen spoke to Bruce about her coronation, she revealed that while the crown may look glamorous, the reality of it is that "it weighs a ton."
"You can't look down to read the speech, you have to take the speech up because if you did, your neck would break - it would fall off," she laughed. "So there are some disadvantages to crowns, but otherwise they're quite important things."
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