Tower Bridge is one of those iconic London scenes and with the 2012 Olympic Games just around the corner (geographically and timewise), it will be seen by many more people than normal over the coming few months.
Since 1892, the Jack Wolfe Barry designed Tower Bridge has provided East London with access from North of the River Thames to the South (and vice versa), via both a road way and an elevated walkway, although the walkway was closed down after just 18 years due to lack of use. It wasn't until 1982 that the public again used the walkway/viewing gantry at the top due to the opening of an exhibition there.
During its 120 year history, it has had a plane fly through it, a bus jump across its raising elements and halted a US President.
More information can be found at www.towerbridge.org.uk/TBE/EN/