There exist several mysterious ciphers, which no expert, no matter what field of expertise they work in and how intelligent they are, has been able to decipher to this day.
The Taman Shud Code
In 1948, the body of a man was found on Somerton beach in Adelaide, Australia. The man was wearing a thick sweater and coat, even though it was very hot that time of year.
There were no clues found about his identity, while his teeth and fingerprints yielded no results.
The autopsy showed profuse hemorrhaging in the stomach of the unidentified man and unusually bloated organs.
Not too far away, they found the suitcase of the man that contained pants with a hidden pocket. It was in this pocket that they found a piece of paper with the words "Taman Shud" written on it.
Taman Shud is a phrase from the rare copy of the book "Rubaiyat of Omar Khayyam". The book with the part missing was found in an abandoned and unlocked car. On the back of the book, there were 5 lines of capital letters, which are thought to be a code of some sort.
To this day, this remains one of the most tangled and unsolvable mysteries in history.
The Dorabella Cipher
It is still unclear whether the Dorabella Cipher is a text or melody. The cipher consists of a series of strange semicircles, which have been the subject of investigation for over a century.
The cipher was sent by Edward Elgar to his friend Dora Penny.
The D'Agapeyeff Cipher
Alexander D'Agapeyeff is the author of a book on cryptography called "Codes and Ciphers". On the last page of the book, he wrote an entire diagram of numbers, which still have not been decoded.
The Shugborough Inscription
It is thought that if this inscription were to be deciphered, it would show the exact location of the Holy Grail - the cup that Jesus drank from during the Last Supper.
The cipher contains the capital letters O-U-O-S-V-A-V-V under a mirror image of the painting the "Shepherds of Arcadia" by Nicolas Poussin. Since Poussin was a member of the Priory of Sion, it is thought that he was dedicated to some Biblical mysteries.
The Beale Ciphers
This is a set of 3 ciphertexts, which of deciphered, would lead to the location of buried treasure worth $40 million.
They were entrusted by Thomas Jefferson Beale to a local innkeeper.
The ciphers are yet to be decoded but it is thought that the treasure is buried in Bedford, Virginia.