The Fortalesa dels Vilars is one of the Iberian world's most unique sites, a superb example of how the fortress employed an imposing defence system. Attributed to the Ilergetes tribe, this settlement established in the Arbeca Plane displays an uncustomary defence system: turreted wall, chevaux-de-frise (barrier of embedded stones laid to impede the enemy's rapid movement when within range and disadvantaged) and moat, unique to the early Iron Age in Europe and the Iberian Culture.

This site forms part of the Archaeology Museum of Catalonia's Iberian Route.