Buckingham Palace is the London residence and administrative headquarters of the monarchy of United Kingdom. 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 congregates to greet crowds. A German bomb destroyed the palace chapel during world war II.Buckingham Palace finally became the principal royal residence in 1837, on the accession of Queen Victoria, who was the first monarch to reside there; her predecessor William IV had died before its completion.