This walled city has always been a major naval port due to its natural harbor and strategic location. Enjoy a hilltop view from Concepción Castle, which served as a fortress for the Carthaginians, Romans and other peoples who once occupied the city. Visit the 1st century B.C. Roman Theater, the remains of the 13th century Cathedral of Santa Maria and the Naval Museum. For modernist architecture, see the City Hall, Grand Hotel and Casino.