The Large city has a sewer. Entroplolis (South-East) will be mostly subterranean. There is a teleport to an upper tower in the Huge temple of Ender near Entropolis, the City of the Gone.

There are a lot of subterranean builds in this one. Even under the Ocean.

I am no longer updating this world as the good builds are being used in a far better map, Iskandria.