The Museum of London has released its Streetmuseum application for the iPhone.
The museum says the application offers users a "window through time". Users can hold their iPhone up to any one of 200 popular London landmarks, to view the location as it was in the past.
The images used by the application range from the Great Fire of London, 1666, to the Swinging Sixties.
When viewing the historical images users can tap the information button and Streetmuseum will provide them with image-specific information.
The launch of the iPhone application marks the opening of the '20 Million Galleries of Modern London' exhibition at the museum. The exhibition is set to include over 7,000 objects highlighting the changes London has experienced over the years.
Speaking to The Sun professor Jack Lohman, Director of the Museum of London said: “This app allows the present and the past to collide and share their secrets. Streetmuseum opens up the city in new and exciting ways. The launch of the Streetmuseum app is an exciting development for the Museum of London.”