The first photograph is a view of Big Ben and the London Parliament from the other side of the Thames, near the Tower of London. It is a fairly dull day but the buildings look impressive against the sky.
This is the famous Tower Bridge of London over the River Thames. It is close to the Tower of London and has become an iconic symbol of London. In the foreground you can see a long barge with people and cars.
The photo below is an image of the bustling city of London, complete with double-decker buses, a telephone booth, traffic, and the London Eye in the background. A larger image of this same scene (not cropped) can be found in another post, a link to which is at the bottom of the post.
This last picture is of a bridge in London which I could not identify. In the foreground you can see the river Thames with two boats, one of them going under the bridge. In the background you can see the buildings of London.
Related Viewing: Silhouettes of the London Skyline or Buckingham Palace Panoramic View or Victoria Memorial Fountain outside Buckingham Palace in London or Britain's Royal Emblem and Sketch
For pictures of more London landmarks: Westminster Palace and Big Ben or London Eye