NPS
The camp used for the Presidential Retreat was initially intended for all federal employees.
Roosevelt’s first day-long visit was on July 5, 1942 and he entertained the first guests on July 18-21, 1942. Throughout the war Roosevelt had a number of important visitors at his mountain retreat. They included OSS director William Donovan, OSS instructor William Fairbairn, Supreme Justice William O. Douglas, Princess Martha of Norway, and Princess Juliana of the Netherlands. The most memorable visitor to Catoctin Recreational Demonstration Area and the residents of Thurmont was British Prime Minister Winston Churchill.
The existence of the Presidential Retreat was a secret. However, Thurmont residents generally knew when the President was in town. Marines would line the roads and bridges and the President was seen traveling through Thurmont in a special limousine escorted by state police. FDR had use of the only armored car in the United States. The FBI had seized the vehicle from gangster Al Capone for tax evasion in 1932.
The camp was not used during the winter months and would remain closed from December to May. The President made 19 visits to his retreat during the summers of 1942 and 1943. Roosevelt spent a total of 64 days at Shangri-La during World War II.
The state of Maryland eventually received only half of the Catoctin Recreational Demonstration area as promised under the original Federal Recreational Demonstration Area program. The northern half remained a unit of the National Park Service at the request of Harry Truman in 1952 in order to maintain a buffer around the Presidential Retreat.