Bastione dell'Impossibile

The Bastione dell’Impossibile is a 16th-century bastion in Trapani, Sicily, whose name derives from the marshy and unstable ground on which it was considered "impossible" to build. Following a long period of abandonment, the municipality of Trapani has outlined plans to reopen the monument for cultural use and limited public access.

Together with the Castello di Terra, the bastion formed part of the landward defensive wall that protected the eastern and south-eastern approaches to the city. This system complemented the northern seaward defences of the Mura di Tramontana, while the Castello della Colombaia controlled maritime access at the western tip of the peninsula. Together these works formed a continuous defensive circuit enclosing the historic city.