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A gallery of memorable Olympic torch designs

Newsround looks at the history of the Olympic torch, where the idea for the relay started and some of the unusual designs.
Sometimes the Olympic flame goes out, so organisers carry a back-up flame kept in an Olympic lantern. This one is from the 2002 Salt Lake City relay.
The Olympic flame is transported in the Olympic lantern at sunrise during the 2002 Salt Lake Olympic torch relay in Wichita, Kansas
The Olympic flame was lit in Greece this week after a fancy, traditional ceremony to mark the start of the torch relay but where did the tradition come from?
The Olympic flame is lit in Greece.
After the Second World War the idea of a torch relay returned for the 1948 Olympic Games in London. It was known as the 'relay of peace'.
Veteran runner H J Bignall (right) hands over the Olympic torch to Fred Prevett at Redhill, Surrey, during the flame's journey from Dover to Wembley Stadium, London, for the opening of the 1948 London Olympics.
Every year the torch became a little more fancy as the organisers tried to out-do the previous host. This torch from Rome in 1960 shows the designs getting a little more lavish.
The Olympic flame arrives in Rome for the opening ceremony of the Rome Olympics, 25th August 1960.
Organisers of the 1984 games in the US went for a more traditional design with posh gold trim.
Gina Hemphill runs through the stadium with the Olympic Torch before the 1984 Olympic Games at the Coliseum Stadium in Los Angeles, USA
The organisers of the Mexico City Olympics in 1968 chose this fancy design but it exploded shortly after this photo was taken and injured both athletes!
An athlete passes the Olympic flame to the next in the relay, ahead of the opening ceremony of the Mexico Olympics, 1968
The Olympic flame originated in ancient Greece, where a fire was kept burning throughout the celebration of the ancient Olympics. But the first torch relay was organised in Germany by the Nazi Party for the 1936 Olympic Games in Berlin.
The torchbearer at the 1936 Olympic Games walks through a crowd.
Here's the torch from 1948 which is going on sale in July 2012.
The London 1948 Olympic torch and programme which will go under the hammer during the Olympic Games.
This year's torch has 8,000 holes - one to represent each torch bearer for the 70-day relay. Here it is just after being lit at a ceremony in Greece. Bring on the Games!
The first torch bearer, swimmer Spyros Gianniotis, runs with the Olympic flame on May 10, 2012 during the lighting ceremony at the ancient site of Olympia.
This torch from Greece in 2004 looks more like a flask of coffee than an Olympic flame but it did the job beautifully.
The 2004 Olympic torch.
Check out this swirly torch from the 2008 Beijing Games which looks like a curled up scroll. Luckily, the organisers had the foresight to make it out of metal and not paper.
The Beijing 2008 Olympic Torch. It is red and looks like a rolled up scroll of paper.
This modern design from 2000 resembles the famous Sydney Opera House in Australia. That year's relay started at Uluru in the Australian desert.
Nova Peris-Kneebone holds the Olympic torch ''Uluru'' prior to the torch arrival, June 7, 2000, at Uluru , Northern Territory, Australia.