London is best known for Big Ben, Buckingham Palace and tea but now they are welcoming the world to the 2012 Olympics!
Around the city, there are traffic jams and Heathrow Airport's seeing record crowds.
Europe's largest city has been preparing for seven years to host millions of visitors. Extra troops were added this week to secure venues like the Olympic Village.
At Olympic Park, there's an 80,000 seat stadium where tomorrow's opening ceremonies will be held, plus nine of the venues where athletes will compete. Swimmers practiced at the aquatics center Wednesday. Michael Phelps, who's won 14 gold medals, could become the most decorated Olympian in history.
Watch the video for a look with NBC's Tracie Potts in London.