Angband

Into the vast and echoing gloom 

more dread than many-tunnelled tomb
in Labyrinthine pyramid
where everlasting death is hid,
down awful corridors that wind
down to a menace dark enshrined;
down to the mountain's roots profound,
devoured, tormented, bored and ground
by seething vermin spawned of stone;
down to the depths they went alone.
The arch behind of twilit shade
they saw recede and dwindling fade;
the thunderous forges' rumour grew,
a burning wind there roaring blew
foul vapours up from gaping holes.
Huge shapes there stood like carven trolls
enormous hewn of blasted rock
to forms that mortal likeness mock;
monstrous and menacing, entombed,
at every turn they silent loomed
in fitful glares that leaped and died
There hammers clanged, and tongues there cried
with sound like smitten stone; there wailed
faint from far under, called and failed
amid the iron clink of chain
voices of captives put to pain.

J.R.R. Tolkien

The Geste of Beren and Lúthien

Book XIII.

(lines 3,850 – 3865)