Angband

Angband, also known as the Iron Prison, was Melkor's 2nd (and last) fortress of Middle-earth. It was destroyed at the War of Wrath at the end of the First Age.

It appeared in The Silmarillion.

Structure
Angband was a stronghold that was built beneath the Iron Mountains, and under the three gigantic volcanoes of Thrangorodrim, the largest mountains in Middle-earth at the time. The entrance to Morgoth's throne room was in the Nethermost Hall. There were also mines that have extended deeper than Morgoth's throne room, possibly extending into the lava beneath the world.

History
Coming soon!

Trivia

 * Angband was Morgoth's second fortress.
 * The first was Utumno.