this is cool. About 5 years back microsoft created the terradata.com database with arial views of the entire US and most of the world that you could pull up and view. not sure if it still exists, but it was pretty cool- I was able to pull up my city and basically see my house-from a few years back.
what I've heard is that the Great Wall was visible from the moon.
(although never found a picture to confirm this...)
Evidently there are a lot of things visible from space. Depends how high you are...
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