The London Eye

The London Eye, or the giant Ferris wheel found in many London's panoramas, is meant to deliver great views -- not a thrilling ride. It circles around slowly, but that said, some recent travelers remark that it's not for those who are scared of heights. When you're more than 400-feet high, the 360-degree views can be a bit disconcerting.

While some travelers say the London Eye is a must do, others say it's an once-in-a-lifetime (and that's all) experience while still others say it's much too expensive for even once in a lifetime. You'll find the London Eye, also known as the Millennium Wheel, off the Waterloo tube stop. 

• Buy your ticket online, over the phone, or at the ticket office in advance to avoid the long lines. For an extra £10, you can save even more time with a Fast Track flight for which you check in 15 minutes before your 'departure.' " -- Fodor's