The Bastion of the Gallows is near Piazza Mercatale, near the bike path on the Bisenzio river that connects Mezzana with Santa Lucia, and was called delle Forche (Gallows) because it stood on the site where the executions were carried out. In the seventeenth century it collapsed because of the river that flowed under it and was then restored, while after the demilitarization of Prato, in the mid-eighteenth century, was sold to private owners. There is a walkway that joins Piazza Mercatale with the Bastion and that was inaugurated in 2005. In 2014 the Bastion was partially restored with the terrace that provides a view of the river and the villas of the early 20^th century.
As part of the Prato Contemporanea 2014 event, the Bastion of the Gallows was the subject of a major urban project dedicated to the Street Art, to new urban languages ​​in their best creative forms and which saw the works of artists as Danilo Bucchi, Veronica Montanino, 108, Lucamaleonte, Moneyless, Tellas, Lo Gnob, Mo2.