The Rock of Gibraltar is a monolithic limestone promontory located on the Iberian Peninsula in southern Europe. It is 426m high and surrounded by the Mediterranean Sea on three sides. The rock is a nature reserve and home to a diverse range of flora and fauna, including the famous Barbary macaques, the only wild monkeys in Europe. The rock's strategic location has made it a prized possession for various nations throughout history, and it has been a British Overseas Territory since 1704. Today, visitors can explore the rock's natural beauty, historic sites, and military fortifications, including the famous Siege Tunnels and the Moorish Castle.