Tower of the Sun

The Tower of the Sun is a fortified outpost of the High Elves. This alabaster fortress watches over sea routes across the southern ocean, and acts as a staging post should the armies of Ulthuan need passage to the lands of Ind, Cathay and beyond. It is always depicted in silhouette.

Source

 * Warhammer: Uniforms & Heraldry of the High Elves pg. 70