Time Travels Greatest

5 Real Objects That Shouldn't Exist in Their Time Period

From ancient batteries to impossibly precise mechanisms, history is littered with objects that seem wildly out of place in their time periods. We're counting down five authenticated artifacts that have stumped scientists and historians—objects so advanced for their era that some wonder if they're evidence of time travelers leaving traces in the past.

The Man Who Received Letters From Himself

In the year 2000, someone calling themselves John Titor appeared on internet forums claiming to be a soldier from 2036 sent back to retrieve an IBM 5100 computer. For five months, he posted detailed descriptions of time travel mechanics, future events, and even uploaded technical diagrams of his time machine before disappearing without a trace. We unravel every thread of the most compelling time traveler story ever told—and investigate whether it might actually be true.

Ground Hogs Day

Looping years

Time Travels Greatest

Greatest time travel topics

Best of pt2

Time Travel Unravel best of episode!