London Eye

Erected for the millennium in 1999-2000, the London Eye was originally meant as a temporary structure and became one of the city's most enduring landmarks instead, its 32 glass capsules completing a slow half-hour rotation with panoramic views stretching as far as Windsor on a clear day. With over 203,000 reviews and a 4.5 rating, it's one of the most-visited paid attractions in the batch, valued more for the vantage point over Big Ben and the Palace of Westminster than for any historical weight. It works well as a way to get your bearings early in a London trip or as a scenic evening finish, and the fixed 45-minute duration makes it easy to slot into a busier day.