The Merlin Entertainments London Eye (commonly the London Eye, or Millennium Wheel, formerly the British Airways London Eye) is a giant 135-metre (443 ft) tall Ferris wheel situated on the banks of the River Thames in Central London, England. It is the tallest Ferris wheel in Europe, and the most popular paid tourist attraction in the United Kingdom, visited by over 3.5 million people annually. The wheel carries 32 sealed and air-conditioned egg-shaped passenger capsules, attached to its external circumference. Each 10 tonne capsule holds 25 people. It rotates at 26 cm (10 in) per second (about 0.9 km/h or 0.6 mph) so that one revolution takes about 30 minutes. The wheel was designed by architects David Marks, Julia Barfield, Malcolm Cook, Mark Sparrowhawk, Steven Chilton, Frank Anatole and Nic Bailey. Consulting engineers Tony Gee & Partners designed the foundation works.