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Begin your explorations in the Plaza de Mina, a large, leafy square with palm trees and plenty of benches. Look out for the ornamental facade on the Colegio de Arquitectos (College of Architects), on the west side of the square.
Next door to the Church of the Holy Cross are the remains of a 1st-century-BC Roman theater, one of the oldest and largest in Spain. The stage is unexcavated (it lies under nearby houses), but you can visit the entrance and large seating area as well as the visitor center.
Few Phoenician settlements have survived intact, but excavations underneath the Puppet Museum revealed some of the best-preserved ruins in Southern Europe. You can visit the 9th-century-BC remains and discover eight houses along two cobbled streets, complete with animal hoofprints encased in mud and clay. The site also has the remains of a Roman fish-preserving factory with saltwater pools.
