Encrypted gravestones are rare, and they have a morbid charm. Here is one located in a town between Liverpool and Manchester. Can you decipher its encrypted inscription?

The Würzburg Residence is one of the most famous castles in Germany. A painting inside shows an encrypted inscription. The solution of this cryptogram is not known to me.

In 1909, an unmarried woman in Newcastle, Australia, received an encrypted postcard. Can a reader decipher it?

The second encrypted message from the Zodiac Killer is one of the world’s most famous unsolved cryptograms. According to computational linguist Tom Juzek, it will never be solved because no solution exists.

Murder victim Ricky McCormick left behind two encrypted notes. Both the crime and the cryptograms are unsolved to date.