A brand new Nexus release, in collaboration with Irondusk33 (author of Spell Research, Religion, Missives, and like a million other awesome mods). To use his words, Terra Umbra is:
An incredible player home for master Alteration mages. New spells found on a corpse near Alftand allow you to raise a portion of the dwemer ruins, including one of the ruined towers. This tower can then be moved to any part of Skyrim, if you have the will to move it.
Basically, it’s pretty awesome.
Available for both classic and SSE: