The London Eye
Each rotation takes about 30 minutes, meaning a capsule travels at a stately 26cm per second, or 0.9km (0.6 miles) per hour - twice as fast as a tortoise sprinting; allowing passengers to step on and off without the wheel having to stop.
The height of the London Eye is 135m (equivalent to 64 red telephone boxes piled on top of each other) making it the fourth tallest structure in London after the BT Tower, Tower 42 and One Canada Square in Canary Wharf.