Introduction to the Armory Gallery: Today's military use of the Tower of London as a fortress was abandoned with the invention of artillery. However, the tower was used as the headquarters of the Ordnance Bureau until 1855. Today, in addition to the building itself, it is a historical relic. In addition, it also serves as an exhibition hall for crowns, royal robes, weapons and armor. The Armory Hall displays various weapons (some exquisite royal armory collections), armor and battle robes used by the royal family in the past dynasties.