Formenos
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In J. R. R. Tolkien's legendarium, Formenos was the stronghold of Fëanor and his sons in the north of Valinor, built after the banishment of Fëanor from Tirion. A great number of the Noldor, including their king Finwë, went with Fëanor into exile.
It was also home to the treasury of Fëanor where he kept the Silmarils, and Melkor slew Finwë. It was a great fortress and armory. Indeed it was one of the few places in Valinor that housed military equipment.