In winter, these slabs let the cold pass and they acted as a conductor in the summer heat, imposing harsh conditions for inmates.

The Piombi prison was divided into six rooms, separated by wooden partitions strengthened with iron plates.

Light is reached through small windows overlooking the waterway called Rio di Palazzo.

It said that since the pre-existing Wells were too harsh for the detention of prisoners it was necessary to build a new structure to house those convicted of minor crimes.

The Piombi were built in the attic of the building, where the Council of Ten had its archive, above the Sala dei Tre Capi.