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Uncovering the secrets of Westminster Palace (also known as the Houses of Parliament), including a hidden tunnel and a hologram of the late Queen.
Windsor Castle is the longest and largest permanently inhabited castle in the world, and has been the family home of British Kings and Queens for almost 1,000 years.
Greenwich Palace was the birthplace of Tudor Monarchs Henry VIII, Mary I and Elizabeth I - before becoming the Royal Naval College in the late 1800s.
Hampton Court bore witness to the very public dramas and the private lives of Henry VIII, his wives and children, in the world of the Tudor Court.