Gazlowe's Excavation Site

Gazlowe's Excavation Site is an unexplored city near Durotar that was excavated by Gazlowe's engineers.

Speculation
The city may have been built by the ancient night elves, similar to the ruins within Stonetalon Peak in Warcraft III, or in the Nightmare Scar of the Southern Barrens in World of Warcraft: Cataclysm. This heritage is implied by the map's tileset, principally shared by the ancient night elf city of Suramar. Alternatively it may have been constructed by the titans, and may be a vault similar to Terramok within Mauradon. The city may be underground, either wholely or partially, like many night elf and titan ruins, although it is shown in Warcraft III to be partially vegetated.