The world's oldest operating ferris wheel is the Great Wheel at Earl's Court in London, England. The wheel was built in 1893 by engineer George Ferris and was originally known as the Chicago World's Fair Ferris Wheel. It was later renamed the Great Wheel after being relocated to London. The wheel has a diameter of 120 feet (37 meters) and a height of 175 feet (53 meters). It carries 36 cars, each of which can accommodate up to 60 passengers.