One of the earliest photographs of an unidentified flying object, this picture was taken somewhere in the United States during the 1920s An object hovers over the sawmill in Ward, Colorado, in April 1929 New Year's Day in 1939: an unidentified man pictured somewhere in the US with an unidentified object in the background So-called foo fighters were often pictured alongside Allied aircraft during sorties and raids in the Second World War Searchlights converge on an unidentified object over Los Angeles on February 25, 1942. The bright blobs around the flashes are anti-aircraft shells exploding This UFO was snapped by an American photographer in Tiensten, Hopeh province, China, in 1942. Several people in the photograph appear to be pointing up at the object A Japanese Sally Bomber flies over the Japanese Sea in 1943 followed by a dark sphere A famous picture taken in Burbank, California, in 1945 featuring Jack LeMonde on a horse with an object in the background Three Army Air Force veterans reported six flying discs over Catalan Island, California, in 1947 and former aerial photographer Bob Jung said he succeeded in photographing one of the objects. The masts of a steamer can be seen at the bottom of the picture CREDIT: Bettmann This cylindrical-appearing UFO was photographed over New York City on March 20, 1950 CREDIT: Knight Guy B. Marquand, Jr., took this picture on a mountain road near Riverside, California, on November 23, 1951. He said the object above the skyline was a "flying saucer" CREDIT: Corbis/Bettmann An amateur photograph of a UFO taken in Passoria, New Jersey, in July 1952 On July 19, 1952, customs inspector Domingo Troncoso took this picture on the jungle frontier between Peru and Bolivia. The big dirigible-shaped craft was flying horizontally and fairly low in the sky, passing from right to left from the observer's posit Washington DC 1952 and some UFOs were photographed flying over the Capitol building during a wave of sightings above the city CREDIT: US Air Force Four Sicilian men watch two unidentified objects over Sicily on December 10, 1954 CREDIT: Bettmann This picture was taken by an unidentified photographer on December 22, 1958, in Poland In this picture by Trevor Constable taken on May 17, 1958, at Giant Rock, California, the object above the ridge was not seen by witnesses at the time but only became apparent after the film was developed CREDIT: Trevor James Constable Another of the most famous UFO photographs ever taken, this was shot by Joseph Sigel on June 18, 1959 in Waikiki, Hawaii CREDIT: US Air Force Alan Smith, 14, took this photograph at about 1.45am on Aug 2, 1965 from his back yard in Tulsa, Oklahoma. Five other witnesses saw the UFO change color from white to red to blue-green. Rex Heflin, an Orange County highway inspector, was at work in a county vehicle on August 3, 1965 when he saw a hat-shaped object hovering above the road. He grabbed his Polaroid camera and took three photographs of the metallic-appearing object In the summer of 1966, a flight security official photographed two red spheres over the Swiss airport Zurich-Kloten. The photo was later released by Swiss Air pilot Ferdinand Schmid 

CREDIT: Michael Hesemann