So the Cabot house npc told me about his dad discovering an alien city in the Arabian desert before the great war. I think it would be an awesome dlc to have an ancient alien city to explore with alien tech and other hazards.
The brotherhood of steel would be interested in this conquest for the technology there and could float over there on their blimp. It would be a BOS crusade of some sort.
Please make this happen Bethesda!

It was not an alien city, it was a lovecraft reference.

Lovecraft's monsters are aliens