The London Eye is a giant Ferris wheel located on the banks of the River Thames in London, England. It is the tallest Ferris wheel in Europe, and offers views up to 135 meters (443 feet) above the ground. Visitors ride in enclosed passenger capsules attached to the wheel's rim and are able to see up to 40 km (25 miles) on a clear day as it rotates slowly around its axis for approximately 30 minutes.