trail in huge cave chamber

access adventure arch archway attractions australia australian background cave cavern cavernous caves chamber coach coachhouse craybacks deserted destination devils discover edges empty enclosed explore footpath formations geology hall hike house inside jenolan landscape limestone massive national natural nature nettle nobody nsw old openended outer park passage passageway path reserve rock rocky scenery selfguided steps staircase stairs stairway stone stones stony stromatolites system through tour tourism tourist track trail travel vacation walkabout walkway wall way wonder rugged