Olympic exhibition celebrates the best of London
More than 10,000 athletes are taking part in the Olympics and more than a million tourists are expected in the capital during the Games.
It's one of the world's greatest cities.
But what comes to your mind when you think of London?
Pomp and circumstance, or Carnaby Street and the swinging '60s?
The BBC's arts correspondent David Sillito went to Christie's to see a collection entitled "My London".