The "Ancient Astronaut Theory"
UFO enthusiasts claim these 12 creations aren't human, are they right?
Published on June 11, 2025
Credit: SoniaJane
The world harbors some impressive relics of past eras, artifacts that seem anachronistically advanced for the times in which they were created. For this reason, some theorists have suggested that the achievements of the Egyptian Empire, prehistoric Japan, and ancient Mesoamerican civilizations were influenced by extraterrestrial forces. While it's entertaining to wonder if aliens have visited Earth, in this article, we will debunk some theories that claim these 12 huge human achievements were not of terrestrial origin.
Ancient cave paintings
Credit: Cazz, Public domain, via Wikimedia Commons
Over the centuries, certain artworks depicting enigmatic figures have contributed to the rise of the "Ancient Astronaut Theory." This hypothesis suggests that in ancient times, extraterrestrial beings visited prehistoric humans, possibly interacting with them and sharing knowledge.
Examples like the Wandjina rock art in Australia's Kimberley region, and an image of two figures in the Val Camonica site in Italy that resemble present-day astronauts, fueled the alien landing theory. However, academics and archaeologists characterize these claims as pseudoarchaeological or unscientific. Some authors also argue that these theories are used to diminish the achievements and abilities of indigenous cultures.
Stonehenge
Credit: Stephen + Alicia
It is common knowledge that with its enormous stones dating past 2400 BC, the purpose and construction methods of Stonehenge have long been contested. While it is widely accepted that ancient humans built the monument, proponents of the Ancient Astronaut Theory argue that the precise alignment of the stones suggests an advanced understanding of astronomical events, specifically, the ability to predict eclipses.
According to these theorists, this ability wouldn't have been possible without extraterrestrial influence. Mainstream archaeologists and astronomers, however, believe this knowledge existed among the early inhabitants of this area and was passed down from generation to generation.
Teotihuacan
Credit: Maciej Cisowski
Teotihuacan, whose name means "the place where the gods were created," is a vast ancient city in Mexico built more than 2,000 years ago, centuries before the rise of the Aztec Empire. The site is renowned for its architecturally significant pyramids, such as the Pyramid of the Sun and the Pyramid of the Moon.
With its well-preserved murals, fine obsidian tools, transportation system, and evidence of advanced agricultural practices, Teotihuacan is often viewed as more technologically developed than it was considered to be possible during its epoch. Although the city’s size and complexity make it seem somewhat otherworldly, it is undoubtedly a human creation.
Antikythera mechanism
Credit: Laura Ockel
This mechanism is a clocklike instrument from around 85 BC, discovered in 1900 near the Greek island of Antikythera. Believed to have been used aboard ships as a navigation tool to accurately predict eclipses and the location of the sun and other celestial bodies. Although comparable technology did not reappear until the 14th century, this device is widely considered the oldest known example of an analog computer.
Because of the precision involved in its construction, UFO enthusiasts have regarded the Antikythera Mechanism as evidence of alien contact. However, ancient Greek literature mentions artifacts like this with no references to otherworldly visitors.
Moai
Credit: blaxxtock
Like many other megalithic sites around the world, the enigmas surrounding the moai, a set of huge stone figures on Easter Island, have long sparked curiosity and speculation. How is it possible that the Rapa Nui people were able to carve and transport these 13-foot-tall statues, each weighing up to 14 tons, more than 1,000 years ago?
The reasons why the moai were created are mysterious. Many may think they are the result of an alien encounter, but it is more likely that they were built for religious or ritual reasons. What remains uncertain is the fate of the artisans responsible for these statues. The main theory suggests the Rapa Nui civilization suffered a severe ecological collapse, likely caused by deforestation and overuse of natural resources.
Dogū
Credit: Metropolitan Museum of Art, CC0, via Wikimedia Commons
Dogū are small humanoid clay figurines created during Japan’s prehistoric Jōmon period. Their distinctive appearance—featuring large eyes, exaggerated limbs, and ornate detailing—has led some Ancient Astronaut theorists to speculate that they resemble beings in space suits, complete with goggles and armor.
However, archaeologists have long noted that the figures' eye shapes closely resemble Inuit snow goggles, a design meant to reduce glare from sunlight on snow. While the precise function of dogū remains uncertain, their pronounced hips, buttocks, and breasts suggest they were likely used in fertility-related rituals or symbolic practices.
Nazca lines
Credit: monikawl999
The Nazca Lines are a collection of hundreds of ancient geoglyphs etched into the desert plains of southern Peru. Some span more than 600 feet and are best viewed from the air, depicting animals, birds, fish, human figures, and various geometric shapes.
Ancient Astronaut theorists speculate that ancient Peruvians were trying to communicate with creatures capable of interstellar travel. Scientists, for their part, have claimed the drawings indicate ceremonial or ritual sites related to water and fertility, key concerns in the arid Nazca region. Also, historians have since replicated similar geoglyphs using primitive techniques without aerial assistance.
Saqqara Bird
Credit: Dawoud Khalil Messiha, Public domain, via Wikimedia Commons
The ancient Egyptian civilization was remarkably advanced for its time. In 1898, archaeologists discovered a small wooden artifact in a tomb at Saqqara, now known as the Saqqara Bird. Made of sycamore wood and shaped like a bird, it has been cited by Ancient Astronaut theorists as potential evidence of early knowledge of flight.
These enthusiasts claim that the figurine’s vertical tail resembles the tail of an aircraft. The lack of legs and the wings’ angle has even led them to conjecture that the artifact is evidence of the Egyptians' knowledge of aerodynamics. Far from being influenced by space creatures, modern scientific studies suggest the Saqqara Bird is either a religious relic or even just a simple children's toy.
Helicopter hieroglyphs
Credit: Olek95, Public domain, via Wikimedia Commons
According to many UFO enthusiasts, the Temple of Seti I at Abydos, Egypt, contains what they claim is definitive proof of advanced ancient technology. Some of the hieroglyphs appear to resemble a helicopter, a jet plane, and even a flying saucer.
However, scholars explain that these glyphs are the result of a palimpsest—a layering of two inscriptions from different time periods. Over time, erosion and the gradual flaking of plaster have caused the superimposed carvings to create ambiguous shapes. What some interpret as a "helicopter" is a combination of the original hieroglyphs from Seti I’s reign and later modifications made during the rule of Ramesses II.
Pyramids of Giza
Credit: Leonardo Ramos
The helicopter hieroglyphs and the Saqqara Bird are not the only Egyptian archaeological findings attributed to intelligent extraterrestrial beings. Throughout history, the Pyramids of Giza have been repeatedly ascribed to aliens, mostly because of the sheer magnitude of their construction.
According to Ancient astronaut proponents, the technology needed to build the pyramids was not available 4,500 years ago. The cuts and placement of the stones as well as their astronomical alignment are said to be so precise that we couldn't re-create them even in modern times. Although the Pyramids of Giza display a remarkable knowledge of engineering, there is plenty of evidence that these tombs are the work of thousands of human hands.
Crop circles
Credit: Артем Дворецкий
In 1966, an Australian man reported seeing a saucer-shaped craft hovering over a field near Tully, Queensland. According to his account, the craft left behind a circular pattern in the crops where it had taken off. Years later, this story inspired two English pranksters to create their own crop circle designs using simple tools.
The phenomenon quickly grew in popularity, with crop circles becoming increasingly complex and intricate. While some believe these patterns are extraterrestrial messages or evidence of advanced alien technology, the vast majority have been proven to be human-made, products of hoaxes, artistic expression, marketing stunts, or tourist attractions.
Norwegian spiral
Credit: Jojo Tesini
In December 2009, a massive spiral of light appeared in the sky over northern Norway, sparking widespread speculation about extraterrestrial visitation. The unusual visual phenomenon lasted for two to three minutes, as evidenced by numerous amateur videos shared online.
UFO enthusiasts took it as evidence of extraterrestrial intelligence, while the official explanation wasn't quite as spectacular. Apparently, a Russian military missile test went out of control. The spiral effect resulted either from a malfunctioning stabilizer engine or the missile spinning as it ran out of fuel before falling into the sea.