Poppi Castle, or the Castello dei Conti Guidi, the main building in the Casentino, known from 1191, was owned by the Counts Guidi. It has additions by Arnolfo di Cambio. It has a courtyard, an external staircase, its chapel with frescos and its library containing rare manuscripts and incunabula.
The annual festival commences in the upper town on 29 June, when a large procession bears the image of the Virgin from the Church of Madonna del Morbo to the Church of Saints Marco and Lorenzo, where it remains for the duration of the week.
Palazzo Crudeli, birthplace of Tommaso Crudeli condemned by the Catholic Church as heretic. He belonged to the first Freemason Lodge of Italy established by the English colony in Florence, 1732. He died in the same Palazzo after torture and imprisonment.