The London Eye is a giant wheel on the River Thames. It is 135 metres tall! It has 32 glass capsules for people to sit in. These capsules represent the 32 parts of London. However, if you look closely, you will see there is no capsule number 13. This is because number 13 is often considered unlucky. One full turn of the wheel takes 30 minutes, so you have plenty of time to take photos of the city. 1. Capsule number 32 is missing for luck.