There are many enduring mysteries in the world that continue to baffle humanity since time immemorial. Our planet is always hiding some part of its history beneath miles of dirt, sand, and rock. Archeologists are still conducting research and excavations to further our understanding of what might have happened millions of years ago.

Commonplace speculation is that interstellar visitors have made contact with earthlings at some point in time. With no substantial proof, it becomes harder to take these conspiracy theories at face value.

On the other hand, there's History Channel's "Ancient Aliens" where almost every prehistoric accomplishment is of extraterrestrial origin. In this article, we're going to list 15 of the most far-fetched theories that the show ever presented.

15 If Levitation By Sound Was Used In The Building Of The Pyramids, It Would Have Been So Loud The Greeks Would Have Confused It With The Wrath Of Zeus

Levitating Rocks Via Frej Agelii

When you hear about the pyramid of Giza, it bespeaks an air of mystery. How did ancient Egyptians build such an astounding monument with primitive tools? To answer that question, Ancient Aliens gives us an implausible theory: levitation by sound. That's right they lifted the 3-ton stones using sound.

14 It's Miraculous That Hundreds Of Animal Figurines Looked Like Planes! Must Be Aliens... Definitely Not Flying Fish

Ancient Extraterrestrial Airplane Via Pinterest

When archeologists found hundreds of small golden animalistic figurines, crafted by a pre-Columbian civilization called Quimbaya, a handful of them had the appearance of a modern airplane. Ancient Aliens theorizes that it was in fact evidence of an extraterrestrial presence around a thousand years ago. What they failed to mention is the striking resemblance to the flying fish.

13 Crystal Skulls: 1000 Year Old Alien Remnants? Nope, 20th Century Carvings (And They Aired The Episode Anyway)

Crystal Skull Via Wikipedia

The Mitchell-Hedges skull was believed to be over a thousand years old. It attracted people from all over the globe and turned out to be a 20th-century carving. Ancient Aliens aired the skull episode in 2013. Meanwhile the tests that proved the skull is in fact a 20th-century carving were conducted in 2008.

12 Extraterrestrials Came To Earth To Mine Gold Because Their Atmosphere Was In Dire Need Of Sustainability. Sure.

Golden Planet Via SUWalls

This particular claim is very off-putting, to say the least. The show theorizes that aliens visited the early age of humankind to mine gold in order to use their particles to preserve the atmosphere on their distant planet. What does that even mean? How can gold particles be used in atmospheres?

11 Crop Circles May Be Representations Of Pi Or Markers For Time Travelers, Who Knows?

Crop Circles Via National Geographic

Despite their great view, crop circles are still a mystery to this day. According to Ancient Aliens, the different shapes translate into the numbers found in Pi. In the same episode, they discuss the possibility of them being used as hallmarks for time travelers, to know what era they landed in.

10 A Portal To Another Dimension Can Be Found In The Antarctic. It's Simply Visible From An Airplane.

Antarctica Via Hurriyet Daily News Via Hurriyet Daily News

A pilot traveling over the Antarctic found a chasm in the icy surface of the south pole. Many years later, he launched an expedition to explore the crevice that turned out to be an interdimensional portal to another world. And they say Narnia was in a closet!

Related: 15 Fictional Places So Amazing We Wish We Could Visit

9 RoboCop? Nah RoboGod Is More Like It. All Hail Robot Osiris.

Robot Osiris Via History

Ancient Egyptian mythology tells the tale of Osiris, the God who was cleaved into 12 pieces by his brother Set to usurp his throne. His wife, Isis, put him back together like a jigsaw puzzle which gave Ancient Aliens the notion that the God of the Underworld is essentially an alien robot.

8 The Seeds Of Distrust Were Sewn Among The Builders Of The Tower Of Babel By Aliens In Order To Halt Their Success

Tower Of Babel Via Pinterest

In ancient mythology, Mesopotamians defied God by attempting to build the Tower of Babel. The show instead portrays the defiance as an act towards extraterrestrial beings, who upon recognizing the power of human solidarity, pitted the builders against each other to stymie their progress.

Related: The Best Shows You Can Find On History Channel (And 5 To Avoid)

7 When They Said Ancient Civilizations Excavated 400,000 Tons Of Stone In Only 18 Years

Ellora Caves Via Pinterest

The Ellora Caves are magnificent rock-cut temples with intricate caves that serve as religious sites for three of the most common religions in pre-tenth-century India. With that being said, comprehensive research shows that it was carved through three different eras that stretched over three centuries. They must have had more than eighteen years to finish the megalithic monument.

6 Eyewitnesses Spot UFO After The Japanese Government Evacuated The Entire Area. Who Spotted It Then?

Fukushima Nuclear Meltdown Via ArcGIS StoryMaps

Back in 2011, an earthquake struck western japan that led to a Tsunami to overload a nuclear plant. The Japanese government hastily evacuated a twenty-kilometer radius to save as many lives as possible. Ancient Aliens claims there was a UFO spotted around the nuclear plant which helped limit the radiation break-out.