AngbandAngband - Morgoth built two great fortresses in Middle-earth; Utumno, which was destroyed in the Battle of the Powers, and Angband.  He built Angband in the far north of the continent in order to defend against an invasion of the Valar from across the Helcaraxë.

 

"And Melkor made also a fortress and armoury not far from the north-western shores of the sea, to resist any assault that might come from Aman.  That stronghold was commanded by Sauron, lieutentant of Melkor, and it was named Angband." ~The Silmarillion, chap.3 (Of the coming of the Elves)