on 19 January 2016, a major fire broke out in the roof of the building. Fifteen fire engines and 60 firefighters responded. The Ritz reopened on 6 June 2016 after a major four-year, multimillion-dollar renovation. In the 21st century, the Ritz is ranked among the most luxurious hotels in the world and the most expensive in Paris. It is referred to by some as the best hotel in Europe and one of the world's most famous hotels. It is one of "The Leading Hotels of the World". Noteworthy historical occurrences During the summer of 1940, the Luftwaffe, the air forces of Nazi Germany during the Second World War, set up their headquarters at the Ritz, with their chief Hermann Göring. Ernest Hemingway, who stayed at the hotel many times after World War II, was there when he learned his third wife, Martha Gellhorn, wanted a divorce. He reacted to the news by throwing her photo into a Ritz toilet and then shooting the photo and the toilet with his pistol. On 22 April 1955, the Duke and Duchess of Parma hosted a coming out ball for their daughter, Princess Cécile Marie of Bourbon-Parma, at the hotel. On 31 August 1997, Diana, Princess of Wales, and Al-Fayed's son Dodi Al-Fayed, and their chauffeur Henri Paul, dined in the Imperial Suite of the hotel before leaving the hotel with bodyguard Trevor Rees-Jones, only to have a fatal car accident in the Pont de l'Alma underpass. During 10 January 2018 five men stole millions of euros worth of jewellery from within the hotel, three were subsequently caught before escaping. Architecture The palace and the square are masterpieces of classical architecture from the end of the reign of Louis XIV. The façade was designed by the royal architect Mansart in the late 17th century before the plot was bought and construction began in 1705. The Hôtel Ritz comprises the Vendôme and the Cambon buildings with rooms overlooking the Place Vendôme, and, on the opposite side, the hotel's garden. The Ritz was among the first hotels in Europe to provide a bathroom en suite, a telephone and electricity for each room. The Hôtel Ritz Paris is 4 floors high, including the mansard roof, and as of 2011 offers 159 rooms, a two-Michelin-starred restaurant, two bars and a casual dining restaurant. Rooms and suites In the 1970s a travel publication Holiday wrote, "Practically every royal head