TQ3380 : Tower Bridge
taken 6 years ago, near to Bermondsey, Southwark, England
Tower Bridge is a combined bascule and suspension bridge over the River Thames. It is close to the Tower of London.
The bridge consists of two towers which are tied together at the upper level by means of two horizontal walkways which are designed to withstand the horizontal forces exerted by the suspended sections of the bridge on the landward sides of the towers.
More details from Wikipedia Link
Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link