Comprehensive lists of notable unsolved cryptograms are available here:

• Elonka’s List of Famous Unsolved Codes and Ciphers
• Klaus’s Top 50 Unsolved Cryptograms List

In our talk Famous and Not-So-Famous Unsolved Cryptograms, we cover the following crypto mysteries:

Kryptos

The Henry Dobosnys murder case

The cigaret case cryptogram

The Cylob cryptogram

The pigeon cryptogram

The Alster bottle posts

The Voynich Manuscript

The Zodiac Killer

The Tamam Shud mystery

The Kaliningrad bottle post

The Fair Game code

James Hampton’s cryptograms