The London Eye, or the Millennium Wheel, is a cantilevered observation wheel on the South Bank of the River Thames in London. It is Europe’s tallest cantilevered observation wheel, and is the most popular paid tourist attraction in the United Kingdom with over 3 million visitors annually. The structure is 135 443 feet tall and the wheel has a diameter of 394 feet. When it opened to the public in 2000 it was the world’s tallest Ferris wheel. The spacious pods go very slowly around the wheel and allow for great views of the Thames and the city.