NargothrondNargothrond - The other great city of the Noldor in Middle Earth.  It was founded by Finrod, son of Finarfin (and brother of Galadriel).  Both Finrod and Turgon were told by Ulmo in a dream where to build their cities.  Whereas Gondolin was modeled after Tirion in Aman, Finrod modeled Nargothrond after the Sindarin city of Menegroth.  Both Gondolin and Nargothrond were built at roughly the same time.  They also fell only 15 years apart.

 

"Now while the city of Gondolin was building in secret, Finrod Felagund wrought in the deep places of Nargothrond; but Galadriel his sister dwelt, as has been told, in Thingol's realm in Doriath...It came to pass that Nargothrond was full-wrought (and yet Turgon still dwelt in the halls of Vinyamar), and the sons of Finarfin were gathered there to a feast; and Galadriel came from Doriath and dwelt a while in Nargothrond." ~The Silmarillion, chap. 15 (Of the Noldor in Beleriand)