Smith Square is a square located in the Westminster district of London, England. During World War II, many parts of London were hit by bombing and signs and relics remained that testify to the events of that historical period.A "ghost sign" is a term that refers to an advertising sign painted on a wall of a building, often dating back decades and still visible despite the passage of time. In Smith Square, there is a famous ghost sign related to World War II.The Smith Square ghost sign is located on one side of a building and bears the message "Air Raid Shelters" along with an arrow pointing in the direction of the shelters. This sign was used to guide people to air raid shelters during air strikes during the war.The Smith Square ghost sign has become a tangible symbol of London's wartime history and is considered a historical landmark in the area. It also represents a testament to the difficult times the city faced during that period of conflict.Many history lovers and tourists visit Smith Square to admire and photograph this ghost sign, which commemorates the courage and resilience of the people of London during World War II.