Siena, Tuscany, Italy -- Piazza del Campo and Siena Horse Race Photo

Piazza del Campo is the secular heart of Siena, a sloping amphitheatre of a square, lined with cafe tables and thronged with tourists, school parties and locals. The Campo is the dramatic setting for the Palio horserace.
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Siena's Palio Horse Race (photo and link)
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The horses race one time around the piazza one time once a year.