Plains City

Plains City is an Autobot base from the Energon portion of the Unicron Trilogy.

If I were better educated, I'd probably recognize this structure.

Plains City was one of five bases constructed by the Autobots and their human allies on Earth in the ten years following the Unicron Battles. One of its purposes was to search for Energon to mine.

Despite its name, it wasn't really on the plains... more like on the cliffs.

Fiction

Energon cartoon

Plains City was attacked by a Terrorcon swarm led by a recently ressurected Megatron. When Autobot reinforcements arrived, they were greeted by the scene of the devastated Plains City and a victorious Megatron. Megatron Resurrected