The Trilmsgitt Towers stand separate but united, and all potentially abandoned. Some time ago, three specialist wizards and brothers — Nyl, Fedge, and Ciuq Trilmsgitt — built their towers within a few miles of one another. The towers had similar construction, and each brother connected his with those of brothers using various teleports and planar portals. None of them have been heard from in quite some time, and the local governor would like to know why — and who inherits their estates if they’re dead.
Sources: Pathfinder Chronicles Campaign Setting