I'm a big fan of the Museum of London. It panders to my penchant for Romans, hosts very interesting exhibitions, and has a great app to guide you around the city itself: Streetmuseum. To mark the launch of version 2.0 of Streetmuseum, the museum has released 16 gorgeous, ghostly images of the city, merging past with present. You can look over the Thames from Tower Bridge, from the 1920s on the left and the 2010s on the right; or stand on the corner of Long Acre and Neal Street (just about where Marks and Sparks is now), looking towards Covent Garden Tube station, 2010 on the left, 1930 on the right. It's wonderful to see how much London has, and hasn't changed. Palace Theatre, 1958, Bob Collins. A night shot outside the Palace Theatre on Shaftesbury Avenue, before an evening's performance.

The new version of the app has had 100s more city locations added to it, meaning that you can select a destination from a London map or let yourself be geo-tagged to your present location. Then a historical image of London will appear on your screen and you can expand it to learn about where you are. Most of these are in central London, but some are in its outer reaches, too.

Charing Cross Road, c.1935, Wolfgang Suschitzky An evening street scene outside Foyles book shop on Charing Cross Road, c.1935.

The photos range in date from 1868 to 2003 and were taken by photographers including Henry Grant, Wolfgang Suschitsky, Roger Mayne, and George Davison Reid.

Cheapside, 1893, Paul Martin. 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'.

The app is free to download to your iPhone and is available now.

Victoria Station, 1950, Henry Grant.

Tower Bridge, c. 1930, George Davison Reid