Clarence House is a royal residence in London, situated on The Mall, in the City of Westminster. It is attached to St. James's Palace and shares the palace's garden. For nearly 50 years, from 1953 to 2002, it was home to Queen Elizabeth The Queen Mother. It has since been the official residence of Charles, Prince of Wales and Camilla, Duchess of Cornwall. Clarence House also served as the official residence for Prince William, Duke of Cambridge from 2003 until his 2011 marriage and for Prince Harry from 2003 until 2012. It is open to visitors for approximately two months each summer, and is one of many royal buildings in London.