I was unaware GoT invented the "Big Frickin' Wall" trope, learn something new every day, I guess.

Kholusia seems to be more of a cliff than a wall though, and given the Dwarves live nearby and "are known for their skill at mining, metallurgy, and crafting mechanical marvels", I expect that to be nothing more than a means of transporting materials, rather than any form of Light-Watch. Honestly my first thought was "That's the Firsts HQ Skylift, right?", given Kholusia is La Noscea...