Welcome to Piazza Salimbeni, a prominent square in the historic center of Siena, in the heart of Tuscany. It sits in the Camollia district, just off the busy shopping street of Via Banchi di Sopra. You step off that lively street and into a surprisingly calm, formal space. This is a place where medieval power, Renaissance architecture and modern finance meet in a single frame. The square has an unusual claim to fame. It still houses the offices of one of the first banking houses in Europe, the Banca Monte dei Paschi di Siena. Medieval towers, a fortress and elegant palaces surround it, and a bronze figure stands at the center. Over the next few minutes we will look at the powerful family who gave the square its name, the moment their fortunes collapsed, the nineteenth century architect who gave the square the look you see today, and the curious monument in the middle. Take a slow look around as we go. This square rewards the patient observer.