The London Eye, and also known as the Millennium Wheel, at a height of 135 metres (443 ft), is the largest Ferris wheel in Europe, and has become the most popular paid tourist attraction in the United Kingdom, visited by over three million people in one year.

The wheel carries 32 sealed and air-conditioned egg-shaped passenger capsules, attached to its external circumference, each capsule representing one of the London Boroughs.