The London Eye is a giant Ferris wheel on the South Bank of the River Thames in London. At 135 meters tall, it is the tallest Ferris wheel in Europe and one of the most popular paid tourist attractions in the world, receiving over 3.5 million visitors annually. It has 32 air-conditioned passenger capsules, each holding 25 people, and offers panoramic views of the city from its wheel, which takes about 30 minutes to complete a full rotation.