One of the two fire tow­ers of the fortress, designed to pro­tect its most vul­ner­a­ble south­ern side, was built in 1460. In peace­time, the tow­er was used as a prison for the nobil­i­ty. A sep­a­rate tick­et is required to vis­it it. The obser­va­tion deck, which is reached by 137 steps, offers a won­der­ful view of the Wawel court­yard.