Towering above Piazza di Porta Ravegnana, one of Bologna’s two leaning towers, Le Due Torri, is an unmistakable landmark. The 97.6m-high Torre degli Asinelli is open to the public, although it’s not advisable for the weak-kneed (there are 498 steps) or superstitious students (local lore says if you climb the tower you’ll never graduate). Built by the Asinelli family between 1109 and 1119, today it leans 1.3m off vertical.