Basilica of Santa Lucia Extra moenia is a Byzantine church built (after Norman rebuilt), according to tradition, in the same place of the martyrdom of the saint in 303 AD. The current appearance is from the 15th–16th centuries. The most ancient parts still preserved include the portal, the three half-circular apses and the first two orders of the belfry. Under the church are the Catacombs of St. Lucy. For this church Caravaggio painted the Burial of St. Lucy, now housed in the Church of Santa Lucìa alla Badìa.
The Château du Haut-Koenigsbourg is situated in a strategic area on a rocky spur overlooking the Upper Rhine Plain, it was used by successive powers from the Middle Ages until the Thirty Years' War when it was abandoned. From 1900 to 1908 it was rebuilt at the behest of the German kaiser Wilhelm II. Today it is a major tourist site, attracting more than 500,000 visitors a year.
The first records of a castle built by the Hohenstaufens date back to 1147. The fortress changed its name to Koenigsburg (royal castle) around 1157. The castle was handed over to the Tiersteins by the Habsburgs following its destruction in 1462. They rebuilt and enlarged it, installing a defensive system designed to withstand artillery fire.
The fortification work accomplished over the 15th century did not suffice to keep the Swedish artillery at bay during the Thirty Years War, and the defences were overrun.