The Iao Valley is one of the most distinct and breathtaking areas in Maui, where mountains reach high into the sky and then suddenly plunge again into the ocean, their craggy rock faces covered with lush vines and plants. One of the most recognizable formations is the Iao Needle, a steep pinnacle overlooking the Iao stream. This was an historical altar where warriors would make sacrifices as they looked upon the surrounding Pu'u Kukui Crater.