Mysteries are short miniquest-esque activities at Archaeology dig sites, usually involving a storyline, that can take anywhere from a few minutes to a few hours or even a few days to complete.
Players can unlock new areas within the dig sites, or different rewards such as Ancient Invention and Ancient Summoning by completing these mysteries. The Archaeology journal may be read to view the current progress of any uncovered mysteries.
Completing all of the mysteries at a specific digsite will automatically unlock that digsite's foreman as a Research team member.
Completing mysteries also completes Mystery Solver achievements at different milestones, which require the player to complete "Gielinor's greatest mysteries", although these refer to any Archaeology mysteries listed below.