Gorham's Cave is considered one of the final known habitations of Neanderthals anywhere in Europe. Excavations have revealed four distinct layers of occupation spanning tens of thousands of years. The deepest level, Level IV, produced 103 Mousterian stone tools -- spear-points, knives, and scraping devices -- dating from between 33,000 and 23,000 years before the present. Above it lie traces of Upper Paleolithic visitors, Neolithic settlers, and Phoenician traders from the eighth to third centuries BC. The cave complex actually comprises four interconnected caverns: Gorham's Cave itself, Vanguard Cave, Hyaena Cave, and Bennett's Cave. Together they form Gibraltar's only UNESCO World Heritage Site, inscribed in 2016.

In 2012, researchers made a discovery that challenged assumptions about Neanderthal cognition. Deep inside the cave, about 100 meters from the entrance, a series of criss-crossing lines had been deliberately cut into a rock ledge. Eight lines arranged in two groups of three, intersected by two shorter ones, covered roughly one square meter of surface. The scratches lay beneath undisturbed sediment at least 39,000 years old, filled with hundreds of Neanderthal stone tools. Joaquin Rodriguez-Vidal of the University of Huelva called it the first directly demonstrable example of abstract art produced in a cave -- a claim that remains hotly debated. Clive Finlayson of the Gibraltar Museum noted the engraving sits precisely where the cave turns 90 degrees. "It's almost like Clapham Junction," he mused. "It does make you wonder whether it has something to do with mapping, or saying: 'This is where you are.'"

The cave owes its name to Captain A. Gorham of the 2nd Battalion Royal Munster Fusiliers, who discovered it in 1907 while prying open a fissure at the back of a sea cavern. He inscribed his name and date in lamp-black on the cave wall -- a tradition of exploration that apparently continued, since a later inscription reading "J. J. Davies 1943" was also found. Governor's Beach, below the cave, had been inaccessible from the cliffs above until a tunnelling project created a spoil pile that provided a path. Lieutenant George Baker Alexander, a Cambridge geologist serving as a Royal Engineer, conducted the first excavation in 1945, though the Gibraltar Museum later challenged his methods. Systematic archaeological work resumed in the 1950s and has continued in various campaigns since.

The cave complex is not merely an archaeological site -- it remains a vital habitat. Various species of bat roost within its chambers, including the European free-tailed bat. More remarkably, the Gorham's Cave Complex forms the largest known wintering roost for Eurasian crag martins in the world. During the 2020-2021 winter season, the roost peaked at 12,000 birds, representing one to two percent of the entire European population of this species. The juxtaposition captures something essential about this place: a cave where Neanderthals once watched the sunset over the Alboran Sea now shelters thousands of migrating birds, a reminder that the impulse to seek shelter here is far older than our species.