Secrets of the Royal Yacht Britannia

Nearly every British monarch built a castle or palace during the course of his or her reign—with Queen Elizabeth II the most notable exception. As royal residences go, it was solely on the Royal Yacht Britannia that the Queen and Prince Philip had a say in the final design, personally selecting its furniture, fabrics and paintings.

The State Drawing Room boasts a Welmar baby grand piano, played at various times by Sir Noël Coward, Princess Diana and Princess Margaret—and bolted to the deck to prevent it from sliding away in choppy seas.