The Postern Tower, as well as featuring an exhibition on the Dukes of Northumberland and their interest in archaeology, includes frescoes from Pompeii, relics from Ancient Egypt and Romano-British objects.
I Postern Tower har udover en udstilling om hertugerne af Northumberland og deres interesse i arkæologi også fresko fra Pompeii, relikvieer fra oldtidens Egypten og romersk britiske genstande.