#1921: The Moon and the Great Wall explain

[Megan is holding her arm up towards Ponytail as they stand atop a large brick wall with {{w|Merlon|merlons}} along the top. They are standing to the left of a tower with three small windows as well as merlons on the top.]

Megan: Did you know that the moon’s craters and plains are the only structures on the surface of a celestial body that can be seen with the naked eye from the Great Wall of China?