When an authentic Civil War photo emerged last year, everyone buzzed about the solider's resemblance to actor Nicolas Cage.
But Cage isn't the only celebrity with a historical doppelganger.
Turns out there's a whole community of people, from TotallyLooksLike.com to YouTube, who post photos of famous people and their historical lookalikes.
While some people think that the celebrities are actually vampires, others believe in the conspiracy theories that the famous people are clones or descendants of former politicians, artists, philosophers and even criminals.
But most just take it all in good fun.
We selected some of the most uncanny doppelgangers from YouTube compilations. From Keanu Reeves to Ellen Degeneres, you'll definitely be shocked by the resemblance.
Here's Nic Cage and his doppelganger. Little is known about the man besides that he supposedly served in the Civil War.
Here's Justin Timberlake, who uncannily resembles this old-time criminal in a mug shot.
Rupert Grint from "Harry Potter" looks like Scottish painter Sir David Wilkie.
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