The Duke and Duchess lived in France in the pre-war years. In 1937, they made a high-profile visit to Germany and met Adolf Hitler at the Berghof, his Berchtesgaden retreat. After the visit, Hitler said of Wallis, "she would have made a good Queen". The visit tended to corroborate the strong suspicions of many in government and society that the Duchess was a German agent, a claim that she ridiculed in her letters to the Duke. U.S. FBI files compiled in the 1930s also portray her as a possible Nazi sympathiser. Duke Carl Alexander of Württemberg told the FBI that she and leading Nazi Joachim von Ribbentrop had been lovers in London. There were even rather improbable reports during the Second World War that she kept a signed photograph of Ribbentrop on her bedside table.