Pozzo di San Patrizio
(Saint Patrick's well) is a well built in the period 1527-1537, based on a
design of Antonio da Sangallo,
and its famous
double helix staircase
DNA :-) will let you walk down into the well (62 meters or 200 feet, 248 steps
for each ramp) and come back up again
without retracing your steps. It was useful to carry out water with donkeys.
Next to the Duomo, the
is now a museum of medieval artefacts. Its basement hosts contemporary
artist Emilio Greco's bronze sculptures. Emilio Greco is
also the author of the Duomo's new doors (1968).
There is also an Etruscan Museum in front of the cathedral and an
Etruscan Cemetery just outside