It isn't. Maybe you're confusing it with Tower Bridge.
The current London Bridge - dating from 1973 - is a pre-stressed concrete structure.
800
the human features of London are London eye, London bridge,big ben,train stations,tower of London, canary wharf,royal obserbatory,Stonehenge,buckhingham palace,hotels.
The bridge is 800 feet in lenght
Big-Ben, London Bridge and the London Eye
The Tower Bridge is a combined bascule and suspension bridge.
The capital of England is London. London is full of entertainment, culture, history and people. It is home to "Big Ben," the London Bridge, Parliament, and so much more.
The original bridge was built by the Romans about 50ad. At the time, it was the only bridge crossing the Thames in London so it just became known as London Bridge.
In the city of LONDON BRIDGE(:
London was re-built in Arizona in the year 1831. This is a big bridge.
Westminster Bridge is in London England adjacent to Big Ben.
It is a concrete bridge so has no need to expand.
The London Bridge in Arizona was designed by John Rennie and dates from1830 so could be described as an historic monument. The current London Bridge in London England only dates from 1973 so is hardly historic.