Le Due Torri (the Two Towers), symbol of Bologna, are remnants of the middle ages, when over 180 of these immense structures made up the skyline of the city. The larger, l'Asinelli, completed in 1109, is an astonishing 97.2 meters high, and the smaller, La Garisenda, 48 meters high, is mentioned by Dante in his Divine Comedy. There are a number of other towers dotted about the city.
The Basilica Santuario di Santo Stefano comprises a group church buildings, including the Romanesque Chiesa del Crocifisso (Church of the Crucifixion), the octagonal La Chiesa del S. Sepolcro (Church of the Holy Sepulchre), and the Benedictine Cloisters. There is a stone basin in the courtyard of the Chiesa del Crocifisso, which some believe to be where Pontius Pilate washed his hands after condemning Christ.
The vast and imposing Basilica di San Petronio, named for the city's patron, is the fifth largest in the world. It was intended to be even larger, but building work was halted in the late 1300s after the Pope expressed concern that it would become bigger than Saint Peter's in Rome, which would have been unacceptable. You can still see the half-constructed apses and the unfinished facade which were the result of the Papal injunction.
The Museo Civico Medievale is housed in the architecturally superb Palazzo Ghisilardi-Fava and has a range of artifacts on show dating from the early Medieval period to the Renaissance. Of particular note is the illuminated manuscript exhibition.