This is pretty incredible and I can't un-hear it.
A Canadian Metallica fan who goes by the name of State of Mercury, took the time to re-imagine a bunch of Metallica songs to sound like they were recorded at different time periods in the band's career. For example, imagine if "Enter Sandman," had actually been on And Justice For All. Listen below.
State of Mercury ALSO gave this treatment to other tunes. Check out what it would sound like if "Creeping Death" and "For Whom The Bell Tolls" were actually on The Black Album. I'm impressed. Metallica fans, you gotta listen: