Torre degli Asinelli

The Asinelli Tower is the taller half of the Due Torri, the leaning medieval pair that stamps Bologna's skyline. The tower's 97.2-metre height and wooden staircase of 498 steps are part of its architectural history.

Why it matters

Bologna in the Middle Ages grew towers the way modern cities grow billboards: dozens of noble families raised them as private fortresses and status statements, and the pair at Porta Ravegnana is what remains of that competition in its most concentrated form. The Asinelli Tower, raised by the family of that name, dominates the pair and remains an emblem of Bologna's civic power. Standing where the ancient Via Emilia entered the medieval town, the tower marks the hinge between Bologna's Roman street plan and its mercantile middle ages. Its survival, unusually intact, makes it the reference point for imagining a city that once bristled with hundreds of similar shafts of brick.

What to notice

The two medieval towers define the square: the taller Asinelli rises beside the more sharply leaning Garisenda, their contrasting profiles framing a narrow street perspective. On the tower itself, notice the fabric of selenite blocks and thin bricks typical of Bolognese medieval work, and the slight batter of the walls as they climb. The interior is a hollow stack of timber stairs and landings, dark and narrow, with arrow-slit windows that flash views of the rooftops as you ascend. From the top platform, on clear days, the grid of the historic centre reads like a map: the terracotta sea, the dome of San Petronio, and the hills with the San Luca sanctuary beyond.

Context and history

The tower's traditional construction dates run between 1109 and 1119, when the Asinelli family raised it beside their houses at the crossroads of Porta Ravegnana; by the following century it had passed into the hands of the Municipality, a change that mirrors the wider story of Bologna's towers being absorbed into civic use as the noble clans declined. Its military role, signalling and defence, never really lapsed: beacons and watch duty kept it useful long after the family that built it had disappeared from the record. The tower has also served science, and its stability has been a matter of civic concern for centuries, all the more so since its shorter neighbour developed its dangerous lean. Today the city manages the pair as a single monument of the Due Torri, and conservation of the fragile medieval fabric remains a continuing concern.