Don’t spend your layover time stuck inside the airport. Instead, discover Royal Windsor.Windsor Castle, the largest and oldest occupied castle in the world, is the home of Her Majesty Queen Elizabeth II. The Castle's dramatic site encapsulates 900 years of British history and its magnificent State Rooms and works of art reflect the tastes of successive kings and queens. HM The Queen and her family spend most of their private weekends at Windsor castle. The Queen is also officially in residence throughout April and June, when the annual Garter Service is held in St George's Chapel.