* The Great Wall of China: Often cited as a visible structure from space, this is a myth. The Great Wall is actually quite difficult to see from orbit, even with the naked eye. Its color blends with the surrounding landscape, and its width is relatively small.
* Other human-made structures: Some large structures like major cities, airports, and dams can be seen from space under the right conditions, but they are not easily recognizable without specialized equipment.
What is visible from space?
* Natural features: The most prominent features visible from space are natural: continents, oceans, mountains, and even large rivers.
* The Earth's atmosphere: The blue hue of our planet is due to the atmosphere, which is clearly visible from orbit.
* Clouds: Weather patterns and cloud formations are readily apparent from space.
* Ice caps and glaciers: The white ice of polar regions is very visible.
In conclusion: There are no "remains" in the sense of ruins or remnants of past civilizations that are visible from outer space. However, some human-made structures are large enough to be seen from orbit, but they are not easily distinguished from other features.
