Two landmark towers, mentioned by Dante in The Inferno, stand side by side in the compact Piazza di Porta Ravegnana. Once every family of importance had a tower as a symbol of prestige and power—and as a potential fortress. Now only 60 remain out of more than 200 that once presided over the city. Torre Garisenda (from the late 11th century), which tilts 10 feet off perpendicular, was shortened to 165 feet in the 1300s and is now closed to visitors. Torre degli Asinelli (circa 1109) is 320-feet tall and leans 7½ feet. If you're up to a serious physical challenge—and not claustrophobic—you may want to climb its 500 narrow, wooden steps to get the view over Bologna.
Piazza di Porta Ravegnana, Bologna, 40126, Italy