Metallica have sold millions upon millions of records since their debut studio album, Kill 'Em All. Over the course of more than three decades, the band has performed on every single continent to hundreds of thousands of fans. They've experienced significant highs in their career, like being inducted into the Rock and Roll Hall of Fame in 2009. They've also suffered terrible lows, most notably losing acclaimed bassist and friend Cliff Burton in a tour bus accident in 1986.

Digging deeper into the history of one of the most successful bands of all-time, we've unearthed 20 facts about Metallica you probably didn't know. Get ready to learn even more about the one and only Metallica:

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