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Restricted access - Nevada Desert, United States.

This photo may be the closest sight you will get of Area 51.

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Military Base - This is where possibly the most controversial American military base is located. Do you know why?

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Mystery - The American government denied the existence of this military base for decades, and it didn't even appear on maps.

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Area 51 - But Area 51 does exist, and theories abound as to why the base was kept secret for so long.

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Explanation? - Many believe that the main explanation for this is also one of humanity's great unanswered questions: do aliens exist?

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Are we alone? - The mystery goes even further: if there is alien life, are they among us? Could it be that the big world powers know about alien life and keep it secret from the public?

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Stories - Area 51 became the subject of lots of alien theories. The most famous theory is known as the Roswell UFO Incident.

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Roswell Incident - As told by HUFFPOST, the incident was reported in 1947 by a rancher who sought out military authorities near Roswell, New Mexico.

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Roswell Incident - According to the rancher, he found wreckage of something he could not identify. The military recovered the wreckage and prevented other people from getting near to the scene.

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Roswell Incident - But what does the Roswell Incident - one of the most famous alien conspiracy theories - have to do with Area 51?

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Aliens - According to the Washington Post, one of the theories about Area 51 is that the location is used by the government to store and examine aliens and spaceships that come to Earth.

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Ufology - Lots of UFO enthusiasts believe that the remains of the supposed spaceship and aliens from the Roswell Incident were taken to Area 51.

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Revelations - The case gained more popularity after several people who claimed to have worked at Area 51 made confessions about their alleged experiences.

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Testimony - As published in The Sun, a man who claimed to have seen the spaceship from the Roswell Incident in Area 51, revealed something even more frightening.

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Face to face - According to the revelation, the former CIA agent interrogated a gray-skinned alien, who had a large brain, very small nose, and holes for ears.

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Alien engineering - The former CIA man also revealed details about how the spaceship used reverse gravity, which was studied and codified.

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Secret passages - Another theory about Area 51 is about the existence of underground bunkers and tunnels which hid spaceships, as shown by Howstuffworks.

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Hoax? - Another conspiracy links Area 51 to one of humankind's greatest feats so far: getting to the moon!

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Conspiracy theory? - According to Howstuffworks, writer Bill Kaysing said that at the end of the 1960s, NASA discovered that it was impossible for man to get to the moon because of radiation exposure.

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Man on the moon? - He said that in order to keep the Apollo program going, NASA staged the moon landings in a studio in Area 51.

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Area 51 - According to Las Vegas Now, a man named Bob Lazar confirmed in a TV interview that he worked with alien technology in Area 51.

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More mysteries - In 2017, The Washington Post  published a report with more surprising information about Area 51.

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Records? - Shortly before leaving his job at the base, Luis Elizondo released three videos which allegedly showed encounters between fighter jets and UFOs.

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Creative inspiration - True or not, the mysterious Area 51 has inspired the arts, whether in literature or cinema.

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Book - One of the most famous publications is from Annie Jacobsen, who wrote a bestseller about Area 51, which put together reports of people who allegedly saw the area up close.

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Film - One of the cinematic depictions was 2011's 'Area 51,' starring  Jason London, Rachel Miner, and Bruce Boxleitner. In 2015 another movie named 'Area 51' was released.

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Tourism - Thanks to the international fame of Area 51, the state of Nevada created the Extraterrestrial Highway, a highway paying tribute to the many mysterious stories that this place has produced.

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Tourism -

Around the area are road signs, buildings and, commercial businesses that profit from the fame of Area 51.

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