While London was a swamp, and Paris, a fishing village, Istanbul, then known as Constantinople, reigned for a thousand years as the world's richest city. At the crossroads of Europe and Asia, it amassed more gold than both continents combined, and safeguarded Christendom's most sacred relics, including the True Cross and heads of the Apostles. The largest walls ever created protected Istanbul's treasures from endless waves of invaders. Immerse yourself in the city that has endured more warfare than any other place on Earth: Istanbul. The world's oldest city, which spans the continents of Europe and Asia, holds many stories of intrigue. Spies, invaders and some of history's most diabolical minds plotted to seize Istanbul, and with it, rule the world.