One of Britain's most impressive buildings, St Paul's is often cited as the nation's favourite cathedral.
Sir Christopher Wren conceived it as a rival to the great churches of Rome, albeit in a Protestant style.
The splendid hotel and station were part of rail's golden age.
Regent's Park is often called the greatest of London's parks.
London's Sewers are a triumph of Victorian engineering.
Visit the world's first underground railway.
The Roman city of London dates back 2,000 years.
A labyrinth of dark passageways which are man-made.
About Seven WondersWe'll tell you about the programme
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