Ah, the mighty Ferris wheel -- provider of a million romantic moments and breathtaking views. For the World's Columbian Exposition of 1893 in Chicago, engineer George Ferris presented fair organizers with his idea of a giant rotating wheel that would carry passengers in cars attached around the outer edge. He convinced organizers to allow him to build the structure, which would rival France's Eiffel Tower. Indeed, Ferris's wheel, which cost $380,000 and stood 264 feet tall with a wheel diameter of 250 feet, was a huge success. Each car held 60 people, and, at 50 cents a ride, the wheel was one of the most popular attractions at the World's Fair. The Ferris wheel is a must-have for any carnival, and thousands of replications continue to delight passengers of all ages.