The room behind Buckingham Palace's famous balcony opens to the public for the first time next week, giving a rare glimpse into one of the royal residence's inner sanctums.
For decades the royal family has been seen emerging from the room after coronations, weddings and other landmark occasions.
From the appearance of World War II leader Winston Churchill alongside the royal family in 1945 to the wedding of King Charles III and Princess Diana in 1981, the balcony and the room behind it has repeatedly played witness to history.
But despite endless images of the balcony, the room itself has always been kept under wraps.
Charles most recently appeared on it following his birthday parade last month along with his daughter-in-law Catherine, Princess of Wales.
The 42-year-old princess's presence drew huge interest as it was her first appearance at an official royal event since she announced she was undergoing cancer treatment earlier this year.
Visitors will be able to see the room as part of a tour of the palace's east wing -- the first time it has been opened to the public since it was created around 175 years ago, AFP reported.
Almost 6,000 tickets for the new tour were snapped up within hours of going on sale in April.
The wing was added between 1847-49 to accommodate the growing family of Queen Victoria and her husband Prince Albert.
"It was Prince Albert's idea to have a balcony at Buckingham Palace, because he saw it as a way of enabling the royal family to connect with the people, and of course that's exactly how, in a sense, it continues to be used on important occasions," said Caroline de Guitaut, surveyor of the king's works of art.