The London home of the Queen Mother for nearly 50 years until her death in 2002, Clarence House is now the residence of Prince Charles, the Prince of Wales; his wife, Camilla, the Duchess of Cornwall; and Prince Harry. The Regency mansion was built by John Nash for the Duke of Clarence (later to become William IV) who considered next-door St. James's Palace to be too cramped for his liking, although post-War renovation work means that little remains of Nash's original.
Since then it has remained a royal home for princesses, dukes, and duchesses, including the present monarch, Queen Elizabeth, as a newlywed before her coronation. The rooms have been sensitively preserved to reflect the Queen Mother's taste, with the addition of many works of art from the Royal Collection, including works by Winterhalter, Augustus John, and Sickert. You'll find it less palace and more home, with informal family pictures and comfortable sofas. The tour (by timed ticket entry only) is of the ground-floor rooms and includes the Lancaster Room, so called because of the marble chimneypiece presented by Lancaster County to the newly married Princess Elizabeth and the Duke of Edinburgh. Clarence House is usually open only for the month of August and tickets must be booked in advance.