London lies on the River .
The financial district and oldest part of London is called the .
is the administrative district of London and area in which you can find all the government buildings.
When the Romans founded the city they called in .
William the Conqueror crowned himself king in .
He also built the of London to protect the city from invaders.
In the Middle Ages the Great killed about 25% of the population.
In the 1970s and 80s the in eastern London were rebuilt.
is the main airport in the western part of London.
The Royal Opera House at hosts performances of big orchestras.