The Great Wall was the name given to the Monolith on the surface of post-Lucifer Europa, near the Europan community called Tsienville.
Difference from other MonolithsEdit
The Great Wall was the largest known Monolith, being approximately 10 kilometers high. Also, unlike all other known Monoliths, the Wall stands horizontally, rather than vertically. There is also the unique fact that the Wall is the only Monolith without "TMA," in its title.