"The sovereignty of Gibraltar was transferred to the Kingdom of Great Britain by the Treaty of Utrecht in 1713 after the War of the Spanish Succession. Most of the Rock's upper area is covered by a nature reserve, which is home to around 250 Barbary Macaques, commonly known as 'apes'; they are the only wild monkeys found in Europe. These macaques, as well as a labyrinthine network of tunnels, attract a large number of tourists each year. In ancient times the Rock of Gibraltar was one of the Pillars of Hercules and was known to the Greeks as Mons Calpe, the other pillar being Mons Abyla on the African side of the Strait. The Rock of Gibraltar marked the limit to the known world and to pass beyond it was to sail to certain destruction over the bottomless waterfall at the edge of the world."
This photo was taken at the visitor center at the top of the Rock.