Donald Trump will stay at Windsor Castle during his state visit to London. Specifically, he and First Lady Melania Trump will stay in one of Windsor Castle's grand guest suites reserved for heads of state. On the evening before the official ceremonies, however, they spent the night at Winfield House, the official London residence of the U.S. ambassador, located in Regent's Park. The main part of the visit, including a royal banquet and other royal ceremonies, takes place at Windsor Castle under the hospitality of King Charles III and Queen Camilla.