The ruins of the Roman town of Pollentia lie just outside Alcúdia’s walls (the entrance is on Avinguda dels Prínceps d’Espanya). Founded around 70 BC, it was Rome’s principal city in Mallorca and is the most important archaeological site on the island. It reached its apogee in the 1st and 2nd centuries AD. A visit takes you through three distinct areas. In the northwest corner is the Portella residential area. Signs indicate the layout of three houses in particular – the first and most interesting is the Casa dels Dos Tresors (House of the Two Treasures), which stood from the 1st to the 5th centuries AD and was a typical Roman house centred on an atrium.