1. Kryptos
Kryptos is a monument that has an insoluble puzzle. This monument is located at CIA headquarters in Langley, Virginia, United States. Kryptos consists of 865 random letters that look very irregular.
So mysterious the meaning of this kryptos itself even up to the brilliant agents in the CIA no one was able to break the code behind it even after more than 27 years passed. Kryptos itself comes from the Greek word meaning "hidden".
2. Voynich Manuscript
The Voynich Manuscript is a book containing mysterious images and letters. The manuscript with a thickness of 240 pages was first discovered by a merchant and antique dealer named Wilfrid M. Voynich (who later became the name of this manuscript). This manuscript was discovered in 1912 among the piles of ancient manuscripts at Villa Mondragone, Rome.
Until now no one has been able to reveal the letters and meanings of this manuscript even to the extent that there is a conclusion that this manuscript is only made by Wilfrid Voynich in order to earn money.
3. Georgia Guidestones Monument
Georgia Guidestones monument is located near the border of South Carolina, Elberton, Georgia, United States. Georgia Guidestones monument is a large granite monument built in 1979 by an unknown person or group of people.
Many suspect the Georgia Guidestones monument was founded by the New World Order pioneers because the message on this monument contains a reduction in the number of human populations in the world. Until now no one knows who actually the founder of Georgia Guidestones this and what exactly is the purpose of the establishment of this monument.
4. Shud Park Code
Shud Park Code is a 4-line code containing letters with no meaning. This code was written on paper and was found simultaneously with the body of an unknown man found on Somerton Beach, Adelaide, Australia on December 1, 1948.
This case is known as the Shud Park Case or Somerton Man and is one of the most unsolved cases in Australian history. Until now either the Somerton man's identity or the strange codes that he found with him remain unsolved and a mystery. Currently there are still many who are challenged to solve what exactly the meaning of the four lines of the letters.
5. WOW signals
The WOW signal is a mysterious signal that is thought to be a signal sent by extraterrestrials. This Wow signal is a radio signal that was first detected successfully by Dr. Jerry R.Ehman on August 15, 1977. Ehman managed to detect this signal when he worked on the Big Ear radio telescope at Ohio State University on a project called SETI.
After a deep study found the fact that this signal comes from the constellation Sagittarius. But the mystery of course how the signal can exist and sent to earth while not found anything or anyone there. Until now the Wow signal is still an unsolved mystery.
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