This is the third photo in this week's series of photos of bridges and you can see three bridges in this photo. In the foreground is Southwark bridge which opened in 1921. Behind that, carrying the train on the left, is the Cannon Street Railway Bridge which opened in 1866. The next bridge is London Bridge which you can't see it in this photo. In the back, you can see the towers of my favourite, Tower Bridge which opened in 1894. Tower Bridge is a bascule bridge because the lower decks lift and it is also a suspension bridge. When this photo was taken the bridge was undergoing renovations which will continue to 2012 and cost £4 million. Tower Bridge is a historic icon, so replacement would be unthinkable.

From Wikipedia:

In April 2008 it was announced that the bridge would undergo a 'facelift' costing £4m, and taking four years to complete. The work entailed stripping off the existing paint down to bare metal and repainting in blue and white. Each section was enshrouded in scaffolding and plastic sheeting to prevent the old paint from falling into the Thames and causing pollution. Starting in mid-2008, contractors worked on a quarter of the bridge at a time to minimise disruption, but some road closures were inevitable. The bridge will remain open until the end of 2010, but is then expected to be closed for several months. It is intended that the completed work will stand for 25 years.