The London Eye This giant observation wheel is the highest in the world. Towering over the Thames opposite the Houses of Parliament, it was built to celebrate the Millenium year. Its 32 enclosed capsules each hold up to 25 people (not counting dolls), and offer views over the whole of London. It takes 30 minutes to go around once. On a clear day like this, you can see 25 miles. I felt as though I were flying over London with Peter Pan!