At 135m, The Merlin Entertainments London Eye is the world’s largest cantilevered observation wheel. It was conceived and designed by Marks Barfield Architects and was launched in 2000. It has already won over 75 awards for national and international tourism, outstanding architectural quality and engineering achievement and has now welcomed over 30 million visitors. The spindle holds the wheel structure and the hub rotates it around the spindle. At 23 meters tall, the spindle is around the size of a church spire and, together with the hub, weighs in at 330 tonnes: over 20 times heavier than Big Ben.