Sand City, Royal Palace
The large block-like bricks in the walls of the Sand City were best to trap the heat in winter and keep it out in summer. The Sand City was the biggest and likely the only large city in the Highland Kingdom, where most economic activities happened. Although the Kingdom spanned from the Wall of Void to the Blood Sea, most economic activities occurred beside the Snake River or to its east.
The King Atrox Highland and the Queen Trinity Highland were the famed power couple as both were Grand Wizards, the only two in the Kingdom. But, sadly, both of them were unable to sire children for some unknown reason, so they treated the entire Kingdom as their family.
Perhaps, the Highland Kingdom was one of the only Kingdoms where most commoners loved their King. Of course, situations like Sphinx Town or Fallshoot village were too small to change the perception of commoners.