London has the oldest metro in the World. First opened in 1863 and went electric in 1890.
Big Ben is the name of the 13 ton bell inside the clock tower. Which is named the Elizabeth Tower.
The London Eye is 135 meters tall and has a diameter of 120 meters. It has 32 capsules (One for each London Borough). A ride takes 30 minutes. It is the tallest Ferris wheel in Europe and weighs over 1000 tonnes.