The entrance to Dante's underworld is situated somewhere in a dark forest:
Midway in the journey of our life
I came to myself in a dark wood,
for the straight way was lost.
Ah, how hard it is to tell
the nature of that wood, savage, dense and harsh --
the very thought of it renews my fear!
It is so bitter death is hardly more so.
But to set forth the good I found
I will recount the other things I saw
Canto I, Divina Commedia, edited by Giorgio Petrocchi and published by Mondadori
Dante often references classical works, and I wonder if this imagery was inspired by a Greco-Roman tale. A forest entrance to Hades, for example.