The London Eye.
The London Eye (Millennium Wheel) at a height of 135 metres (443 ft), is the biggest Ferris wheel in Europe, and has become the most popular paid tourist attraction in the United Kingdom, visited by over 3 million people a year. At the time it was erected it was the tallest Ferris wheel in the world, until it was surpassed by the Star of Nanchang (160m) in May 2006, and then the Singapore Flyer (165m) on February 11, 2008.