Blackness Castle - Gatehouse serves as part of Fort William in Outlander, contributing to the imposing British military presence. This section of the 15th-century fortress adds to the authentic medieval atmosphere that makes Blackness Castle perfect for depicting 18th-century garrison life. The stone walls and defensive architecture create natural drama for military scenes throughout the series. Built as part of Scotland's coastal defenses, this area would have been crucial for the fortress's operational capacity. The historical authenticity requires minimal set decoration to convincingly portray British military dominance. The weathered stone and strategic positioning enhance the oppressive atmosphere of Fort William scenes.