First built in 1248 as a Romanesque basilica with a nave and two aisles, the cathedral gained its current appearance in the 15th century as a Gothic structure, though the Baroque chapels date from the 16th and 18th centuries. Inside, one is treated to the sight of a lavishly adorned altar, which lights up the place all on its own. Don't miss the stained glass window commemorating Pope John Paul II's trip to Slovenia in 1999. Trips to the top of the tower are also available from 11:00-18:00 in spring and summer.