The Wizard of Oz
Yes, even The Wizard of Oz isn't an original idea! Many people know that it was based on a novel written in 1900 by L. Frank Baum. What people don't realize though is that there were tons of versions of this film! Throughout the 20s and 30s, people tried to capture the magical story. The 1939 version got it right though, thanks to colorized film!
The Mummy
In 1999, the world was introduced to "The Mummy." In 2017 though, it rose from the dead again! Clive Barker, Wes Craven, George A. Romero, and Daniel Day-Lewis were all considered for the initial directing position, but it was Stephen Sommers who got the gig. Just look at what he inspired years later!