Cosimo I de' Medici was the second and last duke of Florence from 1537 until 1569, when he became the first grand duke of Tuscany, a title he held until his death. Cosimo I succeeded his cousin to the duchy. From Wikipedia
The 760-meter elevated passageway, built by the Medici family in 1565, is now accessible to the public for the first time, offering unique views and a connection between iconic landmarks.
