The 426-metre limestone monolith marking Europe's southern edge has guarded the strait between two continents for 200 million years, yet its modern border — a single runway bisecting Winston Churchill Avenue — opened only in 1985 after sixteen years of closure. A bus tour from Malaga to Gibraltar traverses 130 kilometres of Andalusian coast before arriving at the land frontier, where passport control divides Spain from the 6.8-square-kilometre British Overseas Territory whose population speaks English, Spanish, and a hybrid dialect called Llanito. Gibraltar's strategic importance shaped three millennia of human history. Phoenician traders named it Calpe, one of the Pillars of Hercules; Moorish commander Tariq ibn Ziyad landed in 711 and lent the Rock its Arabic name, Jabal Tariq. Spain ceded the territory to Britain under the Treaty of Utrecht in 1713, and subsequent sieges — most famously the Great Siege of 1779–1783 — failed to reclaim it. Today the Rock remains a active Royal Navy base, its network of tunnels extending 55 kilometres beneath the Upper Rock Nature Reserve, where more than 200 semi-wild Barbary macaques form Europe's only population of free-roaming primates. The apes are no legend: local superstition insists that British sovereignty will end when the last macaque departs, and Winston Churchill reinforced the troop with North African imports during World War II when numbers fell dangerously low. The Upper Rock Nature Reserve occupies 40 percent of Gibraltar's total land area, rising from sea level to the summit at 426 metres. St. Michael's Cave, a natural grotto whose stalactite chambers descend 62 metres, served as a Neolithic shelter before becoming a concert hall in the 1960s. The Great Siege Tunnels, hand-carved by British and Corsican engineers in five weeks during 1782, allowed cannon to fire downslope at Spanish and French batteries; the network expanded to 52 kilometres during World War II, housing an entire garrison underground. At Europa Point, the southernmost tip accessible by road, the Ibrahim-al-Ibrahim Mosque and Trinity Lighthouse face Morocco across the 13-kilometre strait, where the Mediterranean meets the Atlantic and an average of 300 ships pass daily through one of the world's busiest shipping lanes. Bus tour from Malaga to Gibraltar excursions typically include reserved border-crossing assistance, guided commentary on the territory's hybrid culture, and optional cable-car access to the summit viewing platform. Main Street, the pedestrianised commercial spine, runs 1.6 kilometres from Casemates Square to the Referendum Gates, lined with duty-free shops selling spirits, tobacco, and electronics at prices exempt from Spanish VAT. The currency is Gibraltar pound, pegged 1:1 to sterling, though euros are widely accepted at unfavourable rates.