Palazzo Chigi Zondadari, Palace in Piazza del Campo, Siena, Italy

The palace features a curved stone facade that extends along the edge of Piazza del Campo, displaying 18th-century architectural elements.

The palace has 14th-century origins and was rebuilt in 1724 to a design by Antonio Valeri. Giuseppe Flavio Chigi Zondadari brought Roman painters to fresco the interior, among them Marco Benefial, Placido Costanzi and Giuseppe Colignon.

The interior rooms contain frescoes by several artists including Marco Benefial, Placido Costanzi, and Giuseppe Colignon, representing Italian baroque artistry.

The palace stands at the start of Piazza del Campo's hemicycle, where Via dei Rinaldini (also called Chiasso Largo) opens onto the square. Visitors reach it on foot from the surrounding lanes; the curved brick facade is best seen from the square itself.

The structure houses a marble bust of Pope Alexander VII Chigi created by sculptor Gianlorenzo Bernini, marking its connection to papal history.