This is a shot from the south (?) side of the River Thames. The structure spanning the river is a pedestrian bridge known as the Millennium Bridge, build to help commemorate the new Millennium a few years ago. In the distance is St. Paul’s Cathedral, which was built in 1697 and was designed by the famous British architect Christopher Wren.
When the Millennium Bridge opened, they found that it wobbled excessively and millions of dollars were spent on modifications in order for people to safely walk on it. St. Paul’s does not wobble and never has.