What is the biggest historical mystery that still remains unsolved?

Throughout history, there have been many mysteries that have puzzled historians, scientists, and researchers for centuries. These mysteries have left us with more questions than answers and have captured the imagination of people all over the world. While there are many unsolved historical mysteries, some of the most famous ones include:

• The identity of Jack the Ripper: Between August and November 1888, a serial killer known as Jack the Ripper terrorized the streets of Whitechapel in London, England. Despite the many theories and suspects over the years, the true identity of the killer has never been conclusively proven.
• The fate of the Lost Colony of Roanoke: In 1587, a group of 115 English settlers established a colony on Roanoke Island, off the coast of what is now North Carolina. When a supply ship returned in 1590, the colonists had vanished without a trace. The only clue was the word 'CROATOAN' carved into a tree.
• The Voynich Manuscript: This mysterious manuscript, which dates back to the 15th century, is written in an unknown language and contains illustrations of plants, astrological charts, and other strange symbols. Despite decades of study, the manuscript has never been deciphered.

These mysteries, along with many others, continue to fascinate us and inspire new theories and investigations to this day.