This is no joke. I just saw something on the news about the new ferris wheel in Singapore, the Singapore Flyer. It beats the London Eye by a few meters, but will soon be surpassed by the Great Wheel of China, to be completed in Beijing in 2009. What a name!
I found the picture below in this Shanghai Daily article, which has more info on the Great Wheel if you're interested.
It looks like you'd be able to see a lot on a clear day... but really, how many of those does Beijing get in an average year?