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The London Eye resembles a giant Ferris wheel, but the British call it a cantilevered observation wheel. It's 443 feet tall with views of the Thames River, Big Ben and the Tower of London.
Though it was built to celebrate the millennium, veteran travel writer Laura Powell says it has become a place to celebrate romance. You can arrange a private "capsule" and have chilled Laurent-Perrier Champagne and roses on hand when you pop the question. Prices begin at $383.