Château de Chambord
But inside the building, it is above all the double spiral staircase (or double helix) that gives the Hôtel des Italiens its reputation. It is inspired by that of the Château de Chambord, with the same objective: to allow two populations to take the same staircase without meeting: one flight (with double balustrade) was taken by the management, and the other (single balustrade) by employees.