The palace in the city of Umbar, originally built by the Numenoreans, it fell through the hands of many peoples until at last the Haradrim claimed it as their own. I enjoyed exploring what Numenorean architecture might have looked like influenced by a desert environment and before their style evolved into what we're familiar with in Gondor.
I created a very basic 3D model for use as an underlay/guide to ensure accurate perspective as this is the most complex architectural piece I have ever tackled.