Every day, thousands of people traverse Cardiff’s Queen Street or St John Street. Some may even stop by the corner Burger King for a quick meal.

However, it’s almost certain that most are oblivious to the incredible history concealed above this seemingly ordinary fast food joint.

From the exterior, it appears like any other Burger King, and there are no hints of its rich past once inside.

But if you bypass the Whoppers and fries and venture into an area marked ‘staff only’, you’ll discover one…