Welcome to the sparkling city of Cartagena, where the gold and jewels of the Spanish Main awaited shipment across the Atlantic. No pirate could resist, nor will you be able to when you visit this historic city. The Old Town, a UNESCO World Heritage Site, is surrounded by 400-year-old walls and contains a plethora of churches, fortresses, and restored colonial mansions. Outside the walls are more treasures: Climb the massive Castillo de San Felipe to investigate its maze of hidden tunnels, or shop for the perfect emerald.