Conversation so far:
is london bridge an important landmark for the country
The London Bridge is the site of the oldest crossing of the River Thames on record. It is a symbol of London, recognizable to visitors from all over the world.
when was the london bridge first built
The first London Bridge was built by the Romans as part of their road-building programme, to help consolidate their conquest around AD 55.
was the london bridge ever really falling down
The nursery rhyme London Bridge Is Falling Down has been speculatively connected to several of the bridge's historic collapses.

Question: which materials is the current bridge made of
Self-contained rewrite: which materials is the current london bridge made of