Buckingham Palace, £3.9 billion ($4.8bn)Unsurprisingly, Buckingham Palace is the jewel in the crown of the royal portfolio, with an estimated worth of £3.9 billion (4.8bn).
The Forbidden City also has 9,999 rooms, only one room less than the mythical 10,000 rooms of the palace in heaven. On the roof of the Imperial Palace, you will see nine mythical creatures that were supposed to protect the emperor.
Windsor Castle is a royal residence at Windsor in the English county of Berkshire. It is strongly associated with the English and succeeding British royal family, and embodies almost a millennium of architectural history.