See highlights of Europe's oldest city too difficult to find on your own. Did you know Cadiz's street grid was designed to confuse pirates? Stroll the 15th-century Plaza de San Juan de Dios, constructed on lands reclaimed from the sea. See the Cadiz Cathedral from the outside, with styles ranging from 13th-century Baroque to 19th-century neoclassical, and view the rampart walls of this once-fortified city. Then enjoy some free time .