In the Plaça Major (Main Square) the old Muslim mosque was established, later the university, thereafter town hall until 1987 and, at present, the municipal music school can be found there. Above the entrance arch of this building we can read the date of 1610, which corresponds to the year of expelling the Moors.

This square is built on top of some stone vaults which are accessed down the alley known as Secanella. This place is called Les Voltes and Sitges. Inside, some silos recall the function of cereal storage that Ascó restored from the Muslim period.