The British Airways London Eye is the largest observation wheel (called Ferris wheel according to an American constructor) in the world. Its height is 135m and thus 27m higher than the second highest building in London, St Paul's Cathedral. It is situated on the southern bank of the Thames near Waterloo Station and will be open to the public at the beginning of February. When visibility is good you could look from the top of the wheel as far as Windsor Castle or Heathrow Airport and parts of the counties of Essex, Kent, Hertfordshire, Berkshire and Buckinghamshire. You'll have breathtaking views of Big Ben or the Houses of Parliament just below you.
The wheel is made with 1,700 tonnes of steel which is heavier than 250 double-decker buses. It will turn continuously, at an average of 6000 times a year. It has 32 capsules each of which can hold 25 people. A ride will cost £7.45 for an adult.
If you want more information about the wheel, go to http://www.londoneye.com