For a complete list of updated locations and a map shows points that can be accessed by spires see Ulteran Spires.
Ulteran Spires are typically located deeper within zones (often away from water or ports) than the Globe of Swift Travel, though some zones accessible by globe can be reached by the spire. The spires are often the only travel connection for zones that float like islands in the air and zones that represent other planes of reality. Travel between spire locations was first streamlined with LU56.
Travel to any spire location and click on the portal in the center of the spire. A map will open with all locations for travel.
The Ulteran Spires in any zone can be used to travel to the Overealms: Tenebrous Tangle, Bonemire, and Barren Sky.