The Church of Saint David in Llywel is said to have been dedicated to three saints: David, Darn (Paternus), and Teilo; and known as Llantrisant. Its name was changed when it was granted to the Chapter of Saint David sometime between 1203 and 1229. The nave and chancel date to around 1480, but the tower is slightly earlier. Though the body of the church was restored by Sir George Gilbert Scott in 1869, what we see is almost entirely a product of the 15th century and earlier.
The church displays Perpendicular Gothic architecture. The grave of the writer and preacher David Owen (Brutus) is in the churchyard. As well holding a copy of the famous Llywel Stone, the Church holds the original Aberhydfer stone and old village stocks.
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.