What is the most mysterious object in Roman history?

 The dodecahedron .

This is a mysterious object probably dating back to the 2nd-3rd century AD, found in multiple specimens from Great Britain to Hungary, passing through France, Germany and Italy.

However, no written source that has reached us seems to mention it, and this instrument does not appear in any image , and so scholars can only speculate on how it worked and what it was used for.

These are small, hollow bronze or stone objects , composed of 12 flat pentagonal faces, each with a circular hole in the center. These enigmatic objects range in size from 4 to 11 centimeters.

Hypotheses of all kinds have been formulated, imagining functions linked to astronomy and the agricultural cycle or to religious or esoteric rites.

There are also those who think that they were toys , or tools to help technicians and engineers, perhaps to measure distances.

Finally, some hypothesize that they had a military use and in particular that they helped in the production of slingshot bullets.

All hypotheses formulated with care but lacking any evidence to confirm them.

What are some of the most incredible ancient Roman mysteries?

 Rome was highly organized- but not ideal.

Even the Roman Empire did not escape without losses. And when it did, they did not go back.

First, the Legio IX Hispana. A strong, famous army unit. Then suddenly--gone. And at about 120 AD thousands of soldiers simply disappear into history. No clear battle. No explanation. Either they were disposed of... or transported away somewhere.

And then there are the Sibylian books. They were semi-secret books to be used during large emergencies, such as war or disaster. Leaders trusted them. Then one day, they were burned. Now we can not tell what they had in them.

And then it gets strange.

In Liqian, there are individuals who appear dissimilar to those around them, in terms of being light-skinned, which is not typical of the place. DNA portrays some western ancestry. One of these is that Roman soldiers who had lost their way, had landed there many years ago.

Here's the simple truth:

Even a mighty empire is able to forget what happened.

Armies disappear. Knowledge is destroyed. People move and mix.

And with time, history is something unfinished.