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These remarkable photos are giving people the chance to get a glimpse into London's incredible history - on their smartphones.

The pictures show the jostling life from past and present of some of the capital's best-known sites juxtaposed next to one another when users take a picture of where they are.

They show the difference in our great city between now and 100 years earlier - highlighting the astonishing pace of change which has taken place in the past century.

Now, as well as seeing the changes, a smartphone app is allowing people to walk side by side with Londoners from the past by using GPS to recognise different locations it is being used in.

The app, called Streetmuseum, was originally launched by the Museum of London in 2010, but has now been updated to give users a better idea of how the capital's streets have changed.

Old Meets New: Museum of London Street app 15 show all Old Meets New: Museum of London Street app 1/15 Past meets present Palace Theatre, 1958 and 2014 2/15 Past meets present A view of the forecourt of the Southern Railway's terminus at London Bridge in 1930 and 2014. This was the oldest railway terminus in London, having been built for the line linking London and Greenwich in 1836. The double-decker bus on the right belongs to the London General Omnibus Company which was, in 1933, to become part of the London Transport System. 3/15 Past meets present Covent Garden station, 1930 and 2014: George Davison Reid photographed activity in the marketplace from opposite Covent Garden Underground station on Long Acre. 4/15 Past meets present Blackfriars station, 1930 and 2014: George Davison Reid took this photo of Blackfriars station entrance from outside 179 Queen Victoria Street. The station was originally called St Paul's and was opened by the London, Chatham and Dover Railway in 1886. Above the station were the premises of Oppenheimer Son and Co Limited, which manufactured pharmaceutical specialities. 5/15 Past meets present Oxford Street c.1903 and 2014: Picture: Christina Broom 6/15 Past meets present Duncannon Street 1902 and 2014: View of Duncannon Street decorated with bunting and banners for the coronation ceremony of Edward VII. The National Gallery is visible in the distance 7/15 Past meets present Marble Arch 1956 and 2014 8/15 Past meets present Victoria station in 1950 and 2014: Picture by Henry Grant 9/15 Past meets present Bow Lane, 1930: A view of Bow Lane, off Cheapside in the City of London, looking south to the crossing with Watling Street and St. Mary Aldermary in the middle distance. 'Ye Olde Watling' tavern was originally built just after the Great Fire of 1666. Picture: George Davison Reid 10/15 Past meets present Tower Bridge, 1920 and 2014: From the west side of Tower Bridge, George Davison Reid composed this photo looking out across the Upper Pool. It has been suggested that some of the girls could be Reid's daughters. 11/15 Past meets present Brick Lane: 1957 and 2014 12/15 Past meets present Piccadilly Circus 1953 and 2014 13/15 Past meets present Charing Cross Road, St. Giles Circus c. 1935 and 2014 14/15 Past meets present Byward Street c.1930 15/15 Past meets present Cheapside 1893 and 2014: A street seller of sherbert and water is photographed on Cheapside completely unawares of the camera. Paul Martin was the first photographer to roam around the streets of London with a disguised camera taking candid pictures such as this solely for the purpose of showing 'life as it is'. 1/15 Past meets present Palace Theatre, 1958 and 2014 2/15 Past meets present A view of the forecourt of the Southern Railway's terminus at London Bridge in 1930 and 2014. This was the oldest railway terminus in London, having been built for the line linking London and Greenwich in 1836. The double-decker bus on the right belongs to the London General Omnibus Company which was, in 1933, to become part of the London Transport System. 3/15 Past meets present Covent Garden station, 1930 and 2014: George Davison Reid photographed activity in the marketplace from opposite Covent Garden Underground station on Long Acre. 4/15 Past meets present Blackfriars station, 1930 and 2014: George Davison Reid took this photo of Blackfriars station entrance from outside 179 Queen Victoria Street. The station was originally called St Paul's and was opened by the London, Chatham and Dover Railway in 1886. Above the station were the premises of Oppenheimer Son and Co Limited, which manufactured pharmaceutical specialities. 5/15 Past meets present Oxford Street c.1903 and 2014: Picture: Christina Broom 6/15 Past meets present Duncannon Street 1902 and 2014: View of Duncannon Street decorated with bunting and banners for the coronation ceremony of Edward VII. The National Gallery is visible in the distance 7/15 Past meets present Marble Arch 1956 and 2014 8/15 Past meets present Victoria station in 1950 and 2014: Picture by Henry Grant 9/15 Past meets present Bow Lane, 1930: A view of Bow Lane, off Cheapside in the City of London, looking south to the crossing with Watling Street and St. Mary Aldermary in the middle distance. 'Ye Olde Watling' tavern was originally built just after the Great Fire of 1666. Picture: George Davison Reid 10/15 Past meets present Tower Bridge, 1920 and 2014: From the west side of Tower Bridge, George Davison Reid composed this photo looking out across the Upper Pool. It has been suggested that some of the girls could be Reid's daughters. 11/15 Past meets present Brick Lane: 1957 and 2014 12/15 Past meets present Piccadilly Circus 1953 and 2014 13/15 Past meets present Charing Cross Road, St. Giles Circus c. 1935 and 2014 14/15 Past meets present Byward Street c.1930 15/15 Past meets present Cheapside 1893 and 2014: A street seller of sherbert and water is photographed on Cheapside completely unawares of the camera. Paul Martin was the first photographer to roam around the streets of London with a disguised camera taking candid pictures such as this solely for the purpose of showing 'life as it is'.

Developed by creative agency Brothers and Sisters, it allows people to look through the cameras on their phones at hundreds of sites, where an overlay showing historic photographs will appear across the present-day scene.

Users can select a destination from a map of London, or use geo-tagging and Google Maps to pinpoint their own current location. Once selected, a historic image of their London location appears onscreen. That image can then be expanded, with historical information about a range of subjects also available.

The images featured on the app are taken from the Museum of London's extensive collection, and are the work of renowned photographers including Henry Grant, Wolfgang Suschitsky, Roger Mayne and George Davison Reid.

More than 100 pictures have been added in the update, with dates ranging from 1863 to 2003.

The Museum of London's curator of photographs, Anna Sparham, said: "Our collection provides a fabulous visual history of London, across all aspects of London life. Streetmuseum allows these photographs to be seen by a new audience, and in a thrilling context."