<human>:  What is the history of the London Eye?
<bot>: The London Eye was designed by architects David Marks and Julia Barfield and was completed in 2000. It is a large Ferris wheel situated on the banks of the River Thames in London, England. Standing at a height of 135 meters, it is the tallest cantilevered observation Wheel in the world. The London Eye was built to mark the new Millennium celebrations and has since become an iconic symbol of London. It allows passengers to take in breathtaking views from one of its 32 air-conditioned capsules, each of which can hold up to 25 people. Since it opened, it has welcomed over 70 million visitors to experience its 360° views.