The workings of the German supergun remain something of a mystery, in Poland 1942

A small boy plays with the pigeons in the Piazza del Unita, Trieste in 1950

Eiffel Tower Completed on March 31, 1889, this was the world’s tallest man-made structure for 41 years until the completion of the Chrysler Building in New York in 1930, stretching to 1,062 feet

The CN Tower in Toronto today stands an impressive 1,800 feet high. But this 1973 photograph shows the structure looking slightly less imposing

The magnificent Sydney Opera House stands proud in the Sydney Harbour,

A vintage postcard showing a slice of Kabul

Duck farmer in the outskirts of the city in Shanghai in 1930's

Crowds and boats in the Shanghai harbour in China 1930's

The Rockefeller Center was built between 1931 and 1939 and took the place of more than 200 smaller buildings in the area and employed 225,000 people during the Depression

Many know the famous Hollywood sign in Los Angeles, but some do not know that it actually used to read Hollywoodland, originally conceived as an outdoor ad campaign for a suburban housing development

Grand Central Terminal in New York officially opened on Sunday, February 2, 1913, and more than 150,000 people visited the new building on its opening day

A platform of the Central London Railway extension at Liverpool Street Station in July 1912

A 630-feet tall Gateway Arch remains the tallest man-made national monument in the USA. The foundation of the structure was laid in 1961 but work began in 1963 finishing in two years later in 1965

Space Needle restaurant is moved into place for final assembly. The restaurant serves food to guests 500-foot above sea level and was one of the feature attractions of the Seattle World's Fair of 1962

The Hoover Dam (previously called the Boulder Dam) on the Colorado River under construction in 1936. It stands over 700 feet high today