Sculpted and shaped by the forces of nature, don't miss the fascinating sight of Sakurai Futamigaura. You'll be left wondering precisely how this rocky wonder was formed.
You'll have no end of sightseeing choices when in Fukuoka. Couple Stones Beach is a good place to begin here, but there are loads of other interesting sights to check out. Nokonoshima Island Park, Kyushu University, and Keya no Oto are near the geological formation and will round out your day nicely.