They are Shinto's most sacred shrines. We paid a visit!

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"The Ise Jingu consists of two shrines: the Outer Shrine (Geku), which is dedicated to Toyouke, the Shinto deity of clothing, food and housing, and the Inner Shrine (Naiku), which enshrines the most venerated deity Amaterasu, the Sun Goddess." http://www.japan-guide.com/e/e4300.html