Har Kaldra

Har Kaldra, known as the "Forgotten City," was once a mighty Dark Elven fortress that dominated the landward passes between Naggarond and the Ironfrost Glacier.

In the lore Har Kaldra revolted against the Witch King and was therefore laid to ruin. In Total War Warhammer 2 it seems the city have been repopulated again, or it has yet to revolt.