Gibraltar is a British Overseas Territory on the south coast of Spain known for the Rock of Gibraltar (a major landmark of the region), a 426m limestone ridge at its centre. It is a very unique place for the curious traveller. You can take the time to explore the caves and tunnels. The inside of the rock is an absolute labyrinth with secret internal roads and tunnels four times longer than those on the surface. Military presence and security in this otherwise deserted area is strong but almost invisible.