The Postcrossing meeting in London was 2 months ago but some cards are still travelling. I've read that one of them was missent to Bermuda :o I don't know if this one was missent to Bermuda or somewhere else but it just arrived a few days ago.
I'm not sure who sent it, my best guess points to Tjitske.
"Buckingham Palace is the official London residence of the British monarch. Located in the City of Westminster, the palace is a setting for state occasions and royal hospitality.
Originally known as Buckingham House, the building which forms the core of today's palace was a large townhouse built for the Duke of Buckingham in 1703 on a site which had been in private ownership for at least 150 years. Buckingham Palace finally became the official royal palace of the British monarch on the accession of Queen Victoria in 1837. The last major structural additions were made in the late 19th and early 20th centuries, including the East front which contains the well-known balcony on which the Royal Family traditionally congregate to greet crowds outside. However, the palace chapel was destroyed by a German bomb in World War II; the Queens's Gallery was built on the site and opened to the public in 1962 to exhibit works of art from the Royal Collection.
The original early 19th-century interior designs, many of which still survive, included widespread use of brightly coloured scagliola and blue and pink lapis, on the advice of Sir Charles Long. King Edward VII oversaw a partial redecoration in a Belle epoque cream and gold colour scheme. Many smaller reception rooms are furnished in the Chinese regency style. The Buckingham Palace Garden is the largest private garden in London.
The state rooms, used for official and state entertaining, are open to the public each year for most of August and September, as part of the Palace's Summer Opening." - in: wikipedia