The Praetorium is a tower from Roman times that housed the stairs that allowed the passage from the lower town to the Provincial Forum, to which it is connected by underground passages. Pontius Pilate (who had condemned Jesus in Jerusalem) is also said to have died here. It is one of the corners of the large rectangle of the Provincial Forum Square. In the 12th century it became the palace of the kings of the Crown of Aragon and later a prison. Today you have a fantastic view over Tarragona from the roof (see link video below)
Click here for a video of the views from the Torre del Pretorio