He was greeted by Luxor President Felix Rappaport, who told Angel the powerful beam and the Great Wall of China are the only two man-made creations that can be seen from outer space."
Risking exposure here...
You can see many man-made structures from outer space. It depends on how far up you want to go. Many of these structures look like long, straight lines such as highways, railroads, canals, and of course walls. If the orbit is low enough you can see even more. From 100 miles up you can see extensive road network of the Nile delta. Gemini V astronauts Gordon Cooper and Charles Conrad were able to spot, among other things, a special checkerboard pattern that had been laid out in Texas, a rocket-sled test in New Mexico, and the aircraft carrier that would later pick them up in the Atlantic, along with a destroyer trailing in its wake.
However, from the moon, you can't see anything. According to astronaut, Alan Bean:
"The only thing you can see from the moon is a beautiful sphere, mostly white (clouds), some blue (ocean), patches of yellow (deserts), and every once in a while some green vegetation. No man-made object is visible on this scale. In fact, when first leaving earth's orbit and only a few thousand miles away, no man-made object is visible at that point either."