“Hell on Earth” might not just be an exaggeration. Scattered about the globe are various locations that scientists believe could be entrances to the underworld, ranging from a volcanic ...

But Hierapolis is also home to a dark secret - a passage leading directly to the underworld. Discovered in 2011, the entrance to hell is a small door leading into a cave-like grotto built into one ...

From the nightmarish location that inspired Jesus' account of hell to the cave that mysteriously kills anyone who enters, these locations are as close to hell on Earth as you can get.