Agrigento Cathedral stands at the highest point of the old town, a Baroque and Norman structure dedicated to San Gerlando, the 11th-century Norman bishop who Christianised the region. The present building incorporates parts of several earlier churches on the site, and the nave has an unusual acoustic property — a whisper at the altar can be clearly heard at the far end of the building 45 metres away, a phenomenon known to musicians who have performed here.
The cathedral square offers the best views north over the modern city, which descends the hillside in a fairly undistinguished mass of apartment blocks. Inside, the Treasury Museum holds Norman-era ecclesiastical silver and some good medieval reliquaries. The cathedral is a short walk from Via Atenea, the main street of the old town.