King's Lines

The King's Lines are rock-cut trenches with protective walls carved into the northwestern slopes of the Rock, forming part of Gibraltar's Northern Defences. They connect to surrounding tunnel systems and create a linked network of defensive positions across the fortified territory.

Built after Britain captured Gibraltar in 1704, the Lines were developed through successive phases of construction to counter repeated attacks and siege threats. Engineers continuously adapted their defenses over decades as military tactics and weapons technology evolved.

The fortifications reveal how 18th-century military engineers adapted their designs to rocky terrain and incorporated local features into defensive planning. Walking through the trenches, visitors see evidence of the practical problem-solving that shaped defensive architecture of that era.

Access is typically through interconnected tunnel systems that link to other fortified areas and can be explored as part of a wider defensive network tour. The terrain is rocky and uneven, so sturdy footwear and careful footing are important for safe navigation.

Excavations during construction uncovered fossilized remains that give the site geological significance beyond its military history. These discoveries reveal how fortress building inadvertently exposed evidence of ancient life in the Rock itself.