Slow to arrive idea on fast travel, using the forgotten god altars as a waypoint system for it. "You smash your fists into the altar claiming this place as a conduit for your mortal vessel". Or do you have other plans for them? :3
One way or another, running across those felt to me like they should be a special tiny area, offering some kind of relative refuge, or something to be converted and defiled. Once made a trip specifically to smith something on it to see if anything special would happen