The London Eye.

The London Eye is a giant Ferris wheel on the South Bank of the River Thames in London, England. The entire structure is 135 meters tall and the wheel has a diameter of 120 metres. 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.When erected in 1999 it was the tallest Ferris wheel in the world