Earth is a big place. And over the past several millennia, humans have filled it with big, magnificent things, such as massive pyramids, giant walls, sprawling cities, and much more.
But to the International Space Station (ISS), which is hurtling through space about 250 miles above the surface of Earth, our big planet can look kind of small. Houses, roads, and buildings all disappear. Even some of our biggest constructions can get swallowed up in the swirls of blue, white, and green that characterize our planet.
But, there are some structures that, even 250 miles away, are visible from ISS.
Here are a few of them: