The Berkeley Pit

The pit is less ominous than it sounds...

Looking like a doorway from some Lord of the Rings epic fantasy this entrance leads to Butte Montana's Berkeley Pit.

What is this mysterious pit?

As described by Atlas Obscura, the Berkeley Pit is one of the few places in the world where you have to pay to see toxic industrial waste...

Looks inviting, but you wouldn't wanna swim in it...