You can pray at other locations than altars, depending on your [[Gods|god]]. While these actions will still give you prayer skill, praying at these locations does not increase your faith, but you can get gifts.
:* [[Fo]] - [[Tree#Tree/Bush Ages|Overaged or Shriveled trees]].
:* [[Vynora]] - [[Water tiles]].
:* [[Magranon]] - [[Rock tile]]s.