Olympic rings unveiled on Tower Bridge

The Olympic rings are seen atop the iconic Tower Bridge in London, before they were lowered into position on June 27, 2012, coinciding with one month to go until the start of London 2012 Games. The giant rings, which are fully retractable to allow for tall ships to pass through the bridge, will remain in position for the duration of the Games.

Complete Coverage: London 2012 Olympic Games

Mayor of London Boris Johnson cheers as a giant set of Olympic rings are displayed from Tower Bridge on June 27, 2012, in London. The rings, which weigh more than three tons and measure 82 feet wide by 37 feet tall, will be illuminated in a light-show every evening during the Games.

Complete Coverage: London 2012 Olympic Games

The 2012 Olympic rings are unveiled on London's Tower Bridge during a photocall in London on June 27, 2012. The massive rings - 82 feet wide and 37 feet tall - were unveiled to mark one month to go until the start of the 2012 Olympic Games on July 27, 2012.

Complete Coverage: London 2012 Olympic Games

The Olympic rings are seen atop the iconic Tower Bridge in London after they were lowered into position on June 27, 2012, coinciding with one month to go until the start of London 2012 Games. The giant rings, which are fully retractable to allow for tall ships to pass through the bridge, will remain in position for the duration of the Games.

Complete Coverage: London 2012 Olympic Games

A giant set of Olympic rings are displayed from Tower Bridge on June 27, 2012, in London. The massive rings - 82 feet wide and 37 feet tall - were unveiled to mark one month to go until the start of the 2012 Olympic Games on July 27, 2012.

Complete Coverage: London 2012 Olympic Games

Members of the media photograph the Olympic rings atop the iconic Tower Bridge in London after they were lowered into position on June 27, 2012, coinciding with one month to go until the start of London 2012 Games. The giant rings, which are fully retractable to allow for tall ships to pass through the bridge, will remain in position for the duration of the Games.

Complete Coverage: London 2012 Olympic Games

Mayor of London Boris Johnson, left, and Lord Sebastian Coe, chair of the London Organising Committee of the Olympic Games, cheer as a giant set of Olympic rings are displayed from Tower Bridge on June 27, 2012, in London. The rings, which weigh more than three tons and measure 82 feet wide by 37 feet tall, will be illuminated in a light-show every evening during the Games.

Complete Coverage: London 2012 Olympic Games

A giant set of Olympic rings are displayed from Tower Bridge on June 27, 2012, in London. The rings weigh more than three tons and measure over 82 feet wide by 37 feet tall; they will be illuminated in a light-show every evening during the Games.

Complete Coverage: London 2012 Olympic Games

The Olympic rings are seen atop the iconic Tower Bridge in London after they were lowered into position on June 27, 2012, coinciding with one month to go until the start of London 2012 Games. The giant rings, which are fully retractable to allow for tall ships to pass through the bridge, will remain in position for the duration of the Games.

Complete Coverage: London 2012 Olympic Games

Members of the media photograph the Olympic rings atop the iconic Tower Bridge in London after they were lowered into position on June 27, 2012, coinciding with one month to go until the start of London 2012 Games. The giant rings, which are fully retractable to allow for tall ships to pass through the bridge, will remain in position for the duration of the Games.

Complete Coverage: London 2012 Olympic Games

The Olympic rings are seen atop the iconic Tower Bridge in London after they were lowered into position on June 27, 2012, coinciding with one month to go until the start of London 2012 Games. The giant rings, which are fully retractable to allow for tall ships to pass through the bridge, will remain in position for the duration of the Games.

Complete Coverage: London 2012 Olympic Games

A giant set of Olympic rings are displayed from Tower Bridge on June 27, 2012, in London. The rings weigh more than three tons and measure 82 feet wide by 37 feet tall; they will be illuminated in a light-show every evening during the Games.

Complete Coverage: London 2012 Olympic Games

The Olympic rings are seen atop the iconic Tower Bridge in London after they were lowered into position on June 27, 2012, coinciding with one month to go until the start of London 2012 Games. The giant rings, which are fully retractable to allow for tall ships to pass through the bridge, will remain in position for the duration of the Games.

Complete Coverage: London 2012 Olympic Games