Not just the Great Wall, the world's largest greenhouses are also visible from space! Details inside

It is an intriguing fact that the Great Wall of China is visible from the Moon.For years, schoolbooks and texts have sold the Great Wall of China as the ultimate human flex, claiming it’s visible all the way from space.Up there, thousands of feet above the Earth's sea level, the view isn’t just of continents and swirling clouds; it’s a patchwork of humankind’s messy or marvellous footprint, quite literally!

The Great Wall myth busted!

We’ve all heard that the Great Wall is the only human-made structure visible from space. Turns out, that’s a 300-year-old tall tale writers guessed into existence.Apollo astronauts like Neil Armstrong said you can spot continents and clouds, from the Moon, but no walls. Even from low Earth orbit on the ISS, it’s a no-go with the naked eye.

The Great Wall also blends into the landscape, with its local stone matching the surrounding ridges so well. One can only spot it under perfect “grazing” sunlight that casts long shadows, like in NASA astronaut Leroy Chiao’s 2004 photo. Chinese astronaut Yang Liwei confirmed he couldn’t see it during any of his 14 orbits.

But there is another human-made marvel (or not!) that is visible from space

Replace stone walls with plastic sheets, and it becomes strikingly visible from space. According to Futura-Sciences, Spain’s Almería province, Los Invernaderos de Almería, covers 30,000 to 40,000 hectares of greenhouses.

Astronaut Pedro Duque described it as a clear “white patch” standing out against the darker hills, easy to spot from orbit. This expansive “sea of plastic” produces millions of tonnes of fruits and vegetables for Europe each year.

Duque’s missions confirm it as a prominent human-made feature.

Why Almería is easily visible from orbit

Three special reasons make it stand out: scale, contrast, and reflectivity. The white polyethylene roofs have high albedo, bouncing sunlight like mirrors.

Geometric edges cut sharply against the green-brown terrain, so no camouflage happens here. Covering vast chunks of Andalusia, it’s one of Earth’s densest greenhouse zones. Unlike the Wall’s skinny, earthy line, which is under 6 metres wide, this is clearly visible from space.What are the other eye-catching features visible from orbit?Cities glow, dams gleam, roads snake between deserts. Apart from this, airports and highways also stand out for their night lights. The Wall appears only through shadows, while Almería tops the list for daytime visibility.