The Armoury at Blackness Castle served as Fort William's weapons storage in Outlander, where British forces maintained their military equipment. This section of the 15th-century fortress provided the backdrop for scenes involving military preparations and weapon demonstrations. The stone chambers and vaulted ceilings created an authentic atmosphere for depicting 18th-century garrison life. Built as part of the castle's defensive infrastructure, the armoury would have stored cannons, muskets, and ammunition for the coastal fortification. In the series, these chambers emphasize the military might of the British presence in Scotland. The practical architecture and thick stone walls made it ideal for filming scenes that required period-appropriate military settings.