Angband, the last fortress of Melkor. While Melkor was imprisoned in Valinor, Sauron bred Orcs and other foul beasts to be ready upon Melkor's return. After Melkor returned to Middle Earth, now dubbed Morgoth by the Elves, he raised the volcanic mountain range Thangorodrim around Angband to defend it.
Heir of Isildur by Ssarawolf on DeviantArt
"All that is gold does not glitter, Not all those who wander are lost; The old that is strong does not wither, Deep roots are not reached by the frost. ... Heir of Isildur