A side chamber contains what is probably the historically most valuable part of the collection, the wrought-iron guns of the Middle Ages. These include the world-famous "Pumhart von Steyr", a thousand-pound, 80 cm-calibre stone cannon from the early 15th century. This is the oldest gun from the Imperial armoury and one of the very few surviving huge medieval guns. The opposite chamber and the central area contain brass barrels in all sizes dating back to the 17th and 18th century. The right artillery hall (building 17) contains mostly foreign exhibits, such as Venetian and Turkish gun barrels, though French gun barrels - spoils from the Napoleonic Wars - are also on display. The two side chambers, on the other hand, feature Austrian gun barrels, including some early breech-loading guns.