Once present only in Māori legends, these impressive caves were rediscovered in 1948. Accessible only by boat, the 200m-long system of caves is a magical place with sculpted rocks, waterfalls small and large, whirlpools and a glittering glowworm grotto in its inner reaches. Real Journeys runs 2¼-hour guided tours, reaching the heart of the caves via a lake cruise, walkway and a short underground boat ride. Journeys depart from its office on Lakefront Dr.