NBC News — London's giant Olympic rings were unveiled Monday to mark 150 days until the start of the Summer Games. The rings are 36 feet tall and 82 feet wide.

Monday night they traveled on a barge to the center of the city, passing landmarks including the Tower Bridge and Canary Wharf. The rings will be prominently displayed on the River Thames during the games.

Of course you can catch all of the Olympic action right here on NBC33.