The Irish Crown Jewels were kept in a strongroom, guarded by a loyal officer. Still, they disappeared without a trace, and the door showed no signs of forced entry.
Not a single soul found aboard, yet no signs of struggle or disaster. The ship's log stopped abruptly 10 days before being found.
The Legion IX Hispana, one of Rome's most feared units, disappeared from all records after 120 AD. No battle loss, no mass desertion, they simply went missing.
Satellite images from one day show desert, the next, a lush forest. There's no evidence of human intervention or natural phenomenon.
Astronomers discovered a Fast Radio Burst (FRB) that repeats every 16.35 days. The source is still unidentified.