Gibraltar is home to nearly 30,000 people and is one of the world’s most densely populated places. Sitting on the southern tip of the Iberian Peninsular, it’s sovereignty remains a sensitive point of contention within Anglo-Spanish relations. In both 1967 & 2002 a referendum was held in which Gibraltarians resoundingly rejected plans for a change to Spanish rule. Gibraltar is the fifth most densely populated place on Earth, with nearly 30,000 people living within 2.6 square miles. Favourable tax benefits have been attracting many online gaming firms and international banks to be based there. The rock of Gibraltar itself contains a network of tunnels spanning more than 35 miles, constructed to create a fortress protecting the peninsular from invasion. These tunnels are still used today for military training purposes. It’s strategic position at the gateway to the Mediterranean has meant it remains vital to the British Navy. The tunnels were also home to a nuclear bunker, constructed after WWII and used during the Cold War. Many of the chambers constructed are now used as secure data storage facilities.