The only confirmed artificial structures on the Moon are ones that humans put there. Six Apollo missions left behind descent stages, scientific instruments, flags, rovers, and assorted equipment between 1969 and 1972, and dozens of robotic spacecraft from multiple nations have crash-landed or soft-landed on the surface. NASA’s Lunar Reconnaissance Orbiter has photographed many of these objects in enough detail to distinguish individual tire tracks. Despite decades of claims about alien towers, pyramids, and glass domes, no credible evidence of non-human construction has ever emerged from any imaging dataset, and the story of why people keep seeing things that aren’t there is almost as interesting as the structures that are.
What Humans Have Left Behind
The Moon hosts a surprisingly large inventory of human-made hardware. Each Apollo landing left at least the lower half of the Lunar Module (the descent stage, which served as a launch pad for the ascent stage), along with an American flag, a suite of scientific instruments, and various smaller items including tools, boots, and commemorative plaques. Apollo 15, 16, and 17 each added a Lunar Roving Vehicle that remains parked near its landing site. Beyond NASA’s missions, the Soviet Union’s Luna program deposited two robotic rovers (Lunokhod 1 and 2) and several landers. More recently, China’s Chang’e missions have placed landers and rovers on both the near and far sides. India’s Chandrayaan-3 lander touched down in 2023. All told, there are well over a hundred pieces of hardware scattered across the lunar surface, from spent rocket stages to laser retroreflectors that scientists still bounce Earth-based lasers off of to measure the Moon’s distance.
These are, in the strictest sense, artificial structures on the Moon. They were built by intelligent beings and placed there deliberately. They just happen to be ours.
Seeing Them from Orbit
Most of the dramatic claims about lunar structures originated in an era when the best publicly available images had resolutions measured in hundreds of meters per pixel, making it easy to squint at shadows and imagine architecture. That changed with the Lunar Reconnaissance Orbiter (LRO), which has been circling the Moon since 2009. Its Narrow Angle Camera captures images at resolutions down to about 50 centimeters per pixel, fine enough to spot objects the size of a desk.
Researchers have used these images to pinpoint Apollo hardware with remarkable precision. A study mapping the Apollo 17 landing site combined LRO imagery with the original Apollo surface photography, producing orthorectified images at 0.5 meters per pixel and detailed terrain models, which allowed them to locate hardware, sampling stations, and even the exact spots where astronauts stood to take photographs decades earlier.1Journal of Geophysical Research: Planets. Mapping the Apollo 17 landing site area based on Lunar Reconnaissance Orbiter Camera images and Apollo surface photography In the LRO images, you can see the descent stages as bright dots, the rover tracks as faint lines in the regolith, and even the dark trails where astronauts walked repeatedly between their lander and instrument stations.
A separate analysis went further, using a technique called phase-ratio imagery to detect subtle changes in how the lunar soil reflects light at different sun angles. This revealed photometric anomalies roughly 170 by 120 meters in size at the Apollo 14, 15, and 17 landing sites, caused by the engine exhaust of the landing modules smoothing the soil’s fine texture. It also picked up disturbances from astronaut boots and vehicle wheels, which loosened the regolith in the opposite way.2Icarus. Photometric anomalies in the Apollo landing sites as seen from the Lunar Reconnaissance Orbiter These findings are worth dwelling on: scientists can detect the bootprints of people who walked on the Moon half a century ago. If there were alien ruins of any appreciable size, they would show up in this kind of data.
Why People Keep Seeing Things That Aren’t There
The human brain is spectacularly good at finding patterns, and it does not particularly care whether those patterns are real. When you look at a low-resolution lunar photograph with dramatic shadows, your visual system does what it evolved to do: it hunts for faces, structures, and familiar shapes. This tendency is called pareidolia, and it explains the “face” on Mars, the supposed pyramids near Cydonia, and virtually every claimed alien structure on the Moon.
Research on how pareidolia works shows that people are significantly more likely to see faces, animals, and other natural-world objects in ambiguous images than to see human-made objects. A 2025 study found that when people viewed images containing no actual objects, about 75% of the things they “saw” fell into natural-world categories like faces and animals, while only about 15% resembled human-created objects like buildings or tools.3Nature. Image type reveals evolutionarily shaped perceptual and conceptual mechanisms of pareidolia This means our brains are tuned by evolution to spot living things and faces in noise, which is useful for survival but terrible for objectively evaluating grainy space photos. When someone claims to see a tower or a dome in a lunar photograph, their brain is doing exactly what it was built to do, just in the wrong context.
The problem gets worse at low sun angles, when long shadows stretch across the terrain and even minor topographic bumps cast dramatic silhouettes. A boulder a few meters across can look enormous when its shadow extends dozens of meters. Many of the most famous “anomalous structure” photographs were taken under exactly these lighting conditions. When the same terrain is re-imaged at a higher sun angle, the mysterious tower or pyramid invariably turns out to be an ordinary rock or crater rim.
Natural Formations That Look Engineered
The Moon has several types of geological features that, at a distance or in poor-quality images, can look strikingly artificial. Understanding what produces them is the fastest way to defuse most structure claims.
Linear rilles are long, straight trenches that cut across the lunar surface for tens or even hundreds of kilometers. They look like they were carved by a giant ruler. In reality, they are graben, which form when subsurface magma intrusions (dikes) push upward and cause the rock above to crack and drop down. A study of Rima Parry V and Rima Sirsalis found that the geometry of these features implies subsurface dikes roughly 150 and 600 meters wide, respectively, with the tops of the dikes sitting hundreds to thousands of meters below the surface.4Planetary and Space Science. Lunar graben formation due to near-surface deformation accompanying dike emplacement The result is a perfectly straight trench that can look uncannily like a highway or canal in a low-resolution photograph, but is entirely the product of volcanic plumbing.
Lunar swirls are another category that draws attention. These are bright, sinuous markings on the surface that appear to weave and curl in patterns reminiscent of artwork or writing. They are linked to localized magnetic anomalies in the lunar crust. The bright and dark bands alternate over length scales of one to five kilometers, which requires that the source magnetization come from shallow, narrow structures like buried dikes or lava tubes.5Journal of Geophysical Research: Planets. Lunar Swirl Morphology Constrains the Geometry, Magnetization, and Origins of Lunar Magnetic Anomalies The best-known example, Reiner Gamma, is a bright swirl pattern clearly visible through backyard telescopes. It has been a favorite subject of conspiracy theorists, but detailed study shows that even its smaller sub-features follow the magnetic field geometry predicted by natural volcanic processes.6Icarus. A small lunar swirl and its implications for the formation of the Reiner Gamma magnetic anomaly
Then there are lava tubes, vast underground voids left behind when the outer layer of a lava flow solidified while molten rock continued to drain underneath. Where the roof of a lava tube partially collapses, it creates a skylight: a circular or oblong pit that can look, in orbital images, like the entrance to an underground facility. Some of these tubes are estimated to be large enough to contain a small city. They are entirely natural.
Has Anyone Seriously Searched for Non-Human Artifacts?
Surprisingly, yes. A pair of researchers published a peer-reviewed paper in Acta Astronautica explicitly arguing that the LRO image dataset was good enough to conduct a serious search for alien artifacts on the Moon, and proposing how it should be done. They noted that the Narrow Angle Camera had already imaged more than 25% of the lunar surface at resolutions down to 50 centimeters per pixel, and that several artifacts had indeed been found in this imagery. All of them, however, were created by humans.7Acta Astronautica. Searching for alien artifacts on the moon
The logic behind the search is not as fringe as it sounds. If another civilization ever visited the inner solar system, the Moon is one of the more plausible places where evidence might survive. It has no atmosphere, no plate tectonics, no liquid water, and extremely slow erosion rates. An object left on the lunar surface could persist for millions of years with far less degradation than it would experience on Earth. The paper treated the search as an exercise in what scientists call technosignature detection: looking for signs of technology rather than biological life. The result, so far, is a clean null. Every artificial object in the data traces back to a known human mission.
This null result is actually meaningful. It does not prove that no alien civilization has ever visited the Moon. Something small enough, or buried deeply enough, or old enough to be covered in regolith would escape detection at 50-centimeter resolution. But it does rule out large, intact surface structures anywhere the LRO camera has looked, which amounts to a substantial fraction of the lunar surface. The “alien ruins” that conspiracy theorists point to in old photographs simply are not there when you look with a modern camera.
How the Moon Treats Its Artifacts
While the lack of atmosphere means there is no wind or rain, the lunar surface is far from a benign environment for preservation. The regolith itself is one of the most significant threats to anything sitting on it. Lunar soil consists of fine, jagged, glass-rich particles that cling to surfaces with alarming tenacity. Space agencies now rank lunar dust as one of the most critical challenges for future missions, because the particles are abrasive enough to wear through coatings and seals, adhesive enough to stick to virtually any material, and chemically reactive in ways that degrade metals and fabrics.8Aerospace Science and Technology. A comprehensive contamination assessment methodology for lunar regolith on spacecraft
Beyond dust, the surface is exposed to constant micrometeorite bombardment, cosmic radiation, and extreme temperature swings of roughly 280°C between lunar day and lunar night. Over geological timescales, micrometeorites gradually churn the upper few centimeters of regolith in a process called gardening, which would slowly bury and abrade surface objects. For the Apollo hardware, which has been sitting there for about fifty years, the damage is modest: some discoloration, some dust accumulation, but the descent stages and rovers are still clearly recognizable in orbital images. Over millions of years, though, the story would be different. Any truly ancient artifact would be pitted, coated, and partially buried, making it harder to distinguish from a natural rock.
Researchers have begun applying a new discipline they call planetary geoarchaeology to think systematically about how sites on the Moon change over time, treating the Apollo landing zones as archaeological sites with their own formation processes.9Geoarchaeology. Planetary geoarchaeology as a new frontier in archaeological science: Evaluating site formation processes on Earth’s Moon This work is partly motivated by heritage preservation, but it also provides a framework for understanding what a very old artifact would look like if one were ever found. The short answer: it would not look like a gleaming tower. It would look like a weird rock.
Protecting What Is Already There
The human artifacts on the Moon now represent a peculiar legal and cultural challenge. The Apollo 11 site at Tranquility Base is arguably the single most historically significant location off Earth, yet international space law was not designed to protect heritage sites. The 1967 Outer Space Treaty establishes that no nation can claim sovereignty over any celestial body, which means no country can designate a lunar national park or historic monument in the way it would on Earth. A thesis analyzing the available legal protections under both cultural heritage law and space law found that the fate of humanity’s heritage in space remains genuinely uncertain under existing treaties.10McGill University. Space law and the protection of cultural heritage: the uncertain fate of humanity’s heritage in space
NASA has issued informal guidelines recommending that future missions maintain certain buffer distances from the Apollo sites to avoid disturbing them, but these are voluntary. With multiple nations and private companies planning lunar landers in the coming years, the question of whether anyone will accidentally (or deliberately) damage a historic site is not hypothetical. The concern extends beyond Apollo: the Soviet Lunokhod rovers, the various crashed probes, and even the Beresheet lander that Israel’s SpaceIL crashed in 2019 all represent a growing archaeological record that has no clear legal custodian.
Artificial Structures That May Actually Get Built
If the question is whether artificial structures will exist on the Moon in the future, the answer is almost certainly yes, and the engineering research is further along than most people realize. A major focus is on using lunar regolith itself as a construction material, an approach called in-situ resource utilization (ISRU), because hauling building materials from Earth is prohibitively expensive.
One team demonstrated the feasibility of sintering lunar regolith layer by layer using concentrated sunlight, effectively 3D-printing bricks from lunar soil. Their initial tests with actual sunlight produced uneven results due to atmospheric fluctuations (they were testing on Earth), but switching to a Xenon lamp as a solar simulator allowed them to produce the first solar 3D-printed brick made from lunar regolith simulant. They proposed adapting the technique for use on the Moon to build radiation shielding for habitats and roads before astronauts arrive.11Acta Astronautica. Solar 3D printing of lunar regolith A separate approach used extrusion-based 3D printing to create cellular structures with micro-struts about half a millimeter in diameter, forming trusses that could serve as bricks, blocks, and panels for load-bearing structural elements.12Acta Astronautica. Sintering of micro-trusses created by extrusion-3D-printing of lunar regolith inks
The most ambitious construction concept does not involve building on the surface at all, but inside it. Lava tubes discovered by Japan’s Kaguya orbiter offer enormous underground cavities that are naturally shielded from radiation, micrometeorites, and temperature extremes. Analysis of these tubes suggests they provide stable structures, livable temperatures, acceptably low radiation doses, and minimal meteorite risk.13Space: Science & Technology. Karst Cave as Terrestrial Simulation Platform to Test and Design Human Base in Lunar Lava Tube Building inside a lava tube would mean the Moon’s own geology serves as the outer wall, and humans would only need to construct the interior habitation modules. Some of these tubes are estimated to be wide enough and tall enough to fit entire neighborhoods inside, so the eventual “artificial structures on the Moon” may be invisible from orbit, tucked beneath the regolith in volcanic tunnels that have sat empty for billions of years.
The Conspiracy Claims and What Feeds Them
Despite the evidence, claims about alien structures on the Moon have remarkable cultural staying power. A few recurring factors keep them alive. First, the original Apollo-era photographs were taken on film with 1960s and 1970s optics, then scanned, copied, and compressed through multiple generations. Each round of reproduction introduced artifacts: compression blocks, scanning streaks, and contrast distortions that could look like geometric shapes. Conspiracy proponents often work from these degraded copies rather than the originals archived by NASA, and any attempt to point to better imagery is dismissed as tampering.
Second, the sheer volume of lunar imagery means that, by chance alone, some patches of terrain will contain formations that look startling. A crater rim casting a shadow that resembles a pointed tower. A boulder field that lines up to suggest a wall. A lava tube skylight that, in one lighting angle, looks like a doorway. With millions of images to sift through, the odds of finding something that triggers pareidolia are high. The cognitive bias described earlier means people are predisposed to see meaningful shapes, and then confirmation bias ensures they remember the hits and forget the thousands of boring craters they scrolled past.
Third, government secrecy around some early space program materials, while entirely mundane in origin (Cold War classification of rocket capabilities, bureaucratic slowness in releasing archives), provides fertile ground for conspiracy thinking. The reasoning goes: if they hid some things, they might be hiding this. It is a logic that is impossible to fully disprove, which is precisely what makes it so durable. But it is worth noting that lunar imagery is no longer a monopoly of any single government. Japan, India, China, and the European Space Agency have all sent orbiters with cameras to the Moon. If NASA were concealing alien structures, these independent missions would have revealed them. They have not.
For anyone genuinely curious about whether something unusual exists on the Moon, the LRO image archive is freely available online. You can browse it yourself, zoom in on any terrain feature that catches your eye, and compare it across different lighting conditions. It is one of the few conspiracy topics where the raw data is genuinely accessible to the public, which may be why the claims have shifted over time from “there are structures NASA won’t show you” to vaguer assertions about the far side or about objects too small for current cameras to resolve. The goalposts move as the resolution improves, which tells you something about the strength of the underlying claim.