Fushimi Inari Taisha is the head shrine of all the Inari shrines in Japan. Read more about the shrine here and here. I think Inari is a very interesting deity. Sometimes a god, sometimes a goddess, and sometimes a hermaphroditic being, Inari has been linked to rice, to sake, to agriculture and industry, to fertility, wealth and success. Basically, Inari is the god(dess) of the common people, and the common people would pray to Inari for anything and everything that was important to them. Inari shrines are the most common of all shrines in Japan. There are tens of thousands of them. Read more about Inari here and here.