This style is rare, but historically important. It is also unique in that the honden, normally the very center of a shrine, is missing. It is believed shrines of this type are reminiscent of what shrines were like in prehistorical times. The first shrines had no honden because the shintai, or object of worship, was the mountain on which they stood. An extant example is Nara's Ōmiwa Shrine, which still has no honden. An area near the haiden (hall of worship), sacred and taboo, replaces it for worship. Another prominent example of this style is Futarasan Shrine near Nikkō, whose shintai is Mount Nantai. For details, see Birth and evolution of Shinto shrines above.