London

The British Airways London Eye (Millennium Wheel) stands 135 metres (443 feet) high on the South Bank of the River Thames between Westminster and Hungerford Bridges. It is the world's highest observation wheel. 

The wheel was constructed in sections which were floated up the river Thames on barges and assembled lying flat on pontoons. Once the wheel was complete it was raised into its upright position by cranes, initially being lifted at a rate of about 2 degrees per hour until it reached 65 degrees. 

The total weight of steel in the Eye is 1,700 tonnes.

More information about The London Eye