Once the world's tallest ferris wheel, the London Eye has 32 sealed and air-conditioned capsules, each holding up to 25 people. It is located near Waterloo and the River Thames. A ride on the Eye takes 30 minutes as it trips through 360 degrees of London.
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Pro tip: Do pay attention and read everything in your inbox and on the app. If you need to print the ticket, do so ahead of time, as the closest internet cafe is a haul.
Will totally repeat this purchase when my niece comes over for a visit.