Out-of-place Artifacts are any historical object that seems, at a glance, to go against our understanding of historical chronology. Some artifacts appear "too advanced" for the technology of the period they were created, and seem like they’ve fallen out of time.

The mystery of these artifacts has led to a range of wild speculation, involving everything from aliens to time travel. As much fun as it is to think someone with a flux-capacitor popped by and accidentally left a cell phone in ancient Rome, most of these objects have reasonable explanations within archeology and history.

But the real historical and archeological context behind these Out-of-place artifacts and the ancient cultures which produced them can be just as interesting as speculative theories. So, let’s take a look at seven of the most thought-provoking, and uncover how such astounding artifacts were created.