Are there any man-made objects that astronauts can see from orbit?

There was once a claim that, with the naked eye, astronauts could see the Great Wall of China, but to my knowledge this has been retracted leaving no other contender that I know about off hand. At night, however, you can see cities and roadways as lines and splotches of light.

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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the
NASA IMAGE/POETRY Education and Public Outreach program.