Queen's Lines

The Queen's Lines is a fortified defense system carved into the northwest face of the Rock of Gibraltar. The structure consists of underground tunnels and chambers built into the stone to monitor and control approaches from the mainland.

Military engineers carved these fortifications into the rock during the 18th century. An engineer named William Green oversaw substantial repairs and improvements between 1761 and 1783.

The tunnels show how military engineers adapted their craft to Gibraltar's rocky terrain during the colonial period. Visitors today can observe the practical solutions they built into the stone itself.

Visiting requires advance booking through official guided tours, as the tunnels are not open to general public access for safety and preservation reasons. Wear appropriate footwear because the passages are uneven and can be damp underfoot.

Construction workers discovered a complete fossilized human skeleton embedded within the rock itself during renovation work. The find provides an unexpected glimpse into the geological history layered beneath Gibraltar's military structures.