What is the definition of "ancient aliens?" Do you believe that they have ever existed? If so, what would you consider as proof?

 7 Ancient Sites That Some Believe Were Built by Extraterrestrials

There are some amazing remnants from ancient civilizations on Earth. These buildings appear to defy the technical advancements of their day either because they are too large, too heavy, or too intricate.

As a result, some people contend that the ancient architects who built the Egyptian pyramids, the Nasca lines, and other structures did it by a book of instructions from another planet. Maybe someone from another planet didn't truly create these sites.

Undoubtedly, speculating about whether aliens have ever visited Earth is entertaining. After all, we humans are poised to extend our presence in space, and planets like Mars are within our grasp. But in reality, there is no proof that extraterrestrials have ever visited this planet. 

Additionally, invoking a supernatural explanation for some of the greatest human accomplishments leaves out the fascinating processes by which prehistoric civilizations created some of the biggest and most mysterious structures on Earth.

Sacsayhuamán

In the Peruvian Andes, a castle known as Sacsayhuamán is located outside the former Inca capital of Cusco. Some believe Sacsayhuamán was created by an ancient civilization with a little assistance from extraterrestrials. It was constructed using gigantic stones carved and put together like a jigsaw puzzle.

The interlocking, 1,000-year-old fortress walls are built of boulders that can weigh up to 360 tons apiece and that had to be transported more than 20 kilometers before being raised and precisely placed into position.

A fun little puzzle to solve is how an ancient civilization managed such a feat of engineering; it turns out the Inca were equally skilled at creating homes and fortified cities as they were at keeping track of the sky and keeping calendars. 

Sacsayhuamán isn't the only example of this complex brickwork, in fact. Similar walls can be found all over the Inca Empire, including one in Cusco that has a 12-angled stone expertly wedged into position.

In recent years, archaeologists have discovered remnants of the Inca's rope-and-lever system to move stones from their quarries to their cities—a technique that depended on strength and inventiveness rather than the work of extraterrestrial builders.

Cascade Lines

More than 800 long, straight white lines are randomly carved into the Peruvian desert on a high, arid plateau some 200 miles southeast of Lima. 300 geometric shapes and 70 animal figurines, such as a spider, a monkey, and a hummingbird, are included with them.

The longest lines extend for miles in a straight line. The largest formations may be seen best from the air and are approximately 1,200 feet across. The Nasca lines are frequently recognized as one of the greatest instances of extraterrestrial craftsmanship on Earth due to their antiquity, size, visibility from above, and cryptic nature. Scientists believe the lines could be up to two millennia old. Without the ability to fly, how else would a prehistoric civilization have been able to create such massive artwork in the desert? Then why?

It turns out that understanding the how is rather simple. These cryptic patterns, known as geoglyphs, are created by removing the top, rust-colored layer of rocks to reveal the brighter, white sand beneath.

It's a little more difficult to understand why. When the patterns were first examined in the early 1900s, it was thought they were linked with stars or solstices, but more recent research indicates that the Nasca lines really refer to ceremonial or ritual places associated with water and fertility. The forms may also be seen from nearby foothills in addition to being seen from the air.

African Pyramids

The most well-known of Egypt's pyramids rise from the desert near Giza, a suburb of Cairo. Ancient queens and pharaohs were laid to rest in the majestic monuments known as the Giza Pyramids, which were constructed more than 4,500 years ago.

But how precisely did the Egyptians erect these structures? Millions of carefully cut stones weighing at least two tons apiece make up the Great Pyramid. The construction of a pyramid the size of Pharaoh Khufu would be a hard task even with modern cranes and other tools.

The pyramids' astronomical arrangement, which is said to line up with the stars in Orion's belt, is another interesting aspect. Additionally, proponents of alien theory frequently mention that these three pyramids are in much better condition than those constructed hundreds of years later.

Are the pyramids in Egypt examples of extraterrestrial artifacts? Not quite. While there is plenty of evidence that hundreds of human hands worked to create these tombs, experts are indeed unsure of exactly how the ancient Egyptians constructed the pyramids—especially how they did it so rapidly.

Stonehenge

In the English countryside outside of Salisbury, there is a massive circle of stones, some of which weigh as much as 50 tons. The Neolithic structure known as Stonehenge gave Swiss author Erich von Däniken the idea that it may have served as an alien landing pad and a representation of the solar system. After all, how else could those enormous stones have wound up hundreds of miles away from their original quarry?

Although no one is certain of Stonehenge's actual meaning, none of the other locations in this collection's explanations include extraterrestrial life. Instead, researchers have shown that it is feasible to construct such a thing using tools that would have been available 5,000 years ago when the oldest structures at the site were first constructed.

Right now, it appears that the stones are aligned with solstices and eclipses, indicating that even though the builders of Stonehenge didn't come from above, they were at least keeping an eye on the heavens.

Teotihuacán

The sprawling, prehistoric city of Teotihuacán, also known as the "City of the Gods," is located in Mexico. It is famous for its pyramidal temples and astronomical alignments. Teotihuacán was constructed more than 2,000 years ago, but despite its age, size, and complexity, it is very much a human creation.

Scientists believe that a fusion of cultures, including the Maya, Zapotec, and Mixtec, formed a metropolis that could accommodate more than 100,000 people over centuries. Teotihuacán is frequently regarded as having been more technologically advanced than should have been feasible in pre-Aztec Mexico due to its murals, tools, transportation system, and indications of sophisticated agricultural methods.

The colossal Pyramid of the Sun is by far the most famous structure in Teotihuacán. The odd alignment of the pyramid, one of the biggest such structures in the Western Hemisphere, is said to be based on calendrical cycles.

Holiday Island

The mysteries surrounding Easter Island's moai, a collection of enormous stone statues, very much follow the same pattern as those surrounding the other locations mentioned here: How on earth did the Rapa Nui create these figures more than a thousand years ago? What about how the moai got to Easter Island?

Nearly 900 human figurines made of stone may be seen scattered among the island's dormant volcanoes. The statues, which are 14 tons in weight and average 13 feet tall, seem as though they were sculpted from the Rano Raraku quarry's soft volcanic tuff. There, more than 400 monuments are still being built in various stages, with some finished statues awaiting delivery to their final resting places.

The moai's origins are unknown, although they were probably carved for ceremonial or religious purposes. It's also unclear what happened to the stone-crafting Rapa Nui, although a prominent explanation contends that they perished in a natural calamity of their own construction, which may have been avoidable if ancient aliens had imparted their vast wisdom upon the people.

The Martian Face

Humans will be able to see the "face on Mars" this century if Elon Musk gets his way. The so-called face, which is about two miles long and is in a region named Cydonia that divides the calm plains of the Martian north from the more cratered landscape in the south, was discovered by the Viking 1 orbiter in 1976. 

Scientists rejected the "face" as shadow play at the time, but over the years it has gained popularity among those who believe advanced alien civilizations with a fondness for construction have been visiting the solar system.

The face was once again clearly visible to NASA's Mars Global Surveyor in 2001, but this time, the higher resolution camera revealed nothing. It turns out that what had initially looked to be a face is actually simply another uninteresting Martian mesa, similar to the formations that dot the United States. Southwest.

But it doesn't imply a trip there wouldn't be enjoyable.